Fixed multiple typos

A few "a->an" and "an->a".
"Shows, if the supplied default SOCKS5 proxy" -> "Shows if the supplied default SOCKS5 proxy". Change made on 3 occurrences.
"without fully understanding the ramification of a command" -> "without fully understanding the ramifications of a command".
Removed duplicate words such as "the the".

24 files changed, 41 insertions, 41 deletions

diff --git a/src/chain.cpp b/src/chain.cpp
index a5b369c4fc..8d4c4e7dea 100644
--- a/src/chain.cpp
+++ b/src/chain.cpp
@@ -126,7 +126,7 @@ arith_uint256 GetBlockProof(const CBlockIndex& block)
     if (fNegative || fOverflow || bnTarget == 0)
         return 0;
     // We need to compute 2**256 / (bnTarget+1), but we can't represent 2**256
-    // as it's too large for a arith_uint256. However, as 2**256 is at least as large
+    // as it's too large for an arith_uint256. However, as 2**256 is at least as large
     // as bnTarget+1, it is equal to ((2**256 - bnTarget - 1) / (bnTarget+1)) + 1,
     // or ~bnTarget / (nTarget+1) + 1.
     return (~bnTarget / (bnTarget + 1)) + 1;
diff --git a/src/cuckoocache.h b/src/cuckoocache.h
index 5837549455..2e66901b35 100644
--- a/src/cuckoocache.h
+++ b/src/cuckoocache.h
@@ -176,7 +176,7 @@ private:
      */
     mutable std::vector<bool> epoch_flags;
 
-    /** epoch_heuristic_counter is used to determine when a epoch might be aged
+    /** epoch_heuristic_counter is used to determine when an epoch might be aged
      * & an expensive scan should be done.  epoch_heuristic_counter is
      * decremented on insert and reset to the new number of inserts which would
      * cause the epoch to reach epoch_size when it reaches zero.
@@ -184,7 +184,7 @@ private:
     uint32_t epoch_heuristic_counter;
 
     /** epoch_size is set to be the number of elements supposed to be in a
-     * epoch. When the number of non-erased elements in a epoch
+     * epoch. When the number of non-erased elements in an epoch
      * exceeds epoch_size, a new epoch should be started and all
      * current entries demoted. epoch_size is set to be 45% of size because
      * we want to keep load around 90%, and we support 3 epochs at once --
diff --git a/src/httpserver.h b/src/httpserver.h
index 6be9950682..9df56e5fc5 100644
--- a/src/httpserver.h
+++ b/src/httpserver.h
@@ -86,7 +86,7 @@ public:
 
     /**
      * Get the request header specified by hdr, or an empty string.
-     * Return an pair (isPresent,string).
+     * Return a pair (isPresent,string).
      */
     std::pair<bool, std::string> GetHeader(const std::string& hdr);
 
@@ -125,7 +125,7 @@ public:
     virtual ~HTTPClosure() {}
 };
 
-/** Event class. This can be used either as an cross-thread trigger or as a timer.
+/** Event class. This can be used either as a cross-thread trigger or as a timer.
  */
 class HTTPEvent
 {
diff --git a/src/leveldb/db/version_set.h b/src/leveldb/db/version_set.h
index c4e7ac360b..7935a965a7 100644
--- a/src/leveldb/db/version_set.h
+++ b/src/leveldb/db/version_set.h
@@ -376,7 +376,7 @@ class Compaction {
   // Each compaction reads inputs from "level_" and "level_+1"
   std::vector<FileMetaData*> inputs_[2];      // The two sets of inputs
 
-  // State used to check for number of of overlapping grandparent files
+  // State used to check for number of overlapping grandparent files
   // (parent == level_ + 1, grandparent == level_ + 2)
   std::vector<FileMetaData*> grandparents_;
   size_t grandparent_index_;  // Index in grandparent_starts_
diff --git a/src/policy/fees.h b/src/policy/fees.h
index 7125a74f03..2029ce3744 100644
--- a/src/policy/fees.h
+++ b/src/policy/fees.h
@@ -48,7 +48,7 @@ class TxConfirmStats;
  * in each bucket and the total amount of feerate paid in each bucket. Then we
  * calculate how many blocks Y it took each transaction to be mined.  We convert
  * from a number of blocks to a number of periods Y' each encompassing "scale"
- * blocks.  This is is tracked in 3 different data sets each up to a maximum
+ * blocks.  This is tracked in 3 different data sets each up to a maximum
  * number of periods. Within each data set we have an array of counters in each
  * feerate bucket and we increment all the counters from Y' up to max periods
  * representing that a tx was successfully confirmed in less than or equal to
diff --git a/src/qt/clientmodel.cpp b/src/qt/clientmodel.cpp
index de00eacdb9..3dfb51ccfa 100644
--- a/src/qt/clientmodel.cpp
+++ b/src/qt/clientmodel.cpp
@@ -303,7 +303,7 @@ static void BlockTipChanged(ClientModel *clientmodel, bool initialSync, const CB
     }
     // if we are in-sync, update the UI regardless of last update time
     if (!initialSync || now - nLastUpdateNotification > MODEL_UPDATE_DELAY) {
-        //pass a async signal to the UI thread
+        //pass an async signal to the UI thread
         QMetaObject::invokeMethod(clientmodel, "numBlocksChanged", Qt::QueuedConnection,
                                   Q_ARG(int, pIndex->nHeight),
                                   Q_ARG(QDateTime, QDateTime::fromTime_t(pIndex->GetBlockTime())),
diff --git a/src/qt/coincontroldialog.cpp b/src/qt/coincontroldialog.cpp
index b9da48ee1d..b1d48a92f7 100644
--- a/src/qt/coincontroldialog.cpp
+++ b/src/qt/coincontroldialog.cpp
@@ -499,7 +499,7 @@ void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog)
         {
             // there is some fudging in these numbers related to the actual virtual transaction size calculation that will keep this estimate from being exact.
             // usually, the result will be an overestimate within a couple of satoshis so that the confirmation dialog ends up displaying a slightly smaller fee.
-            // also, the witness stack size value value is a variable sized integer. usually, the number of stack items will be well under the single byte var int limit.
+            // also, the witness stack size value is a variable sized integer. usually, the number of stack items will be well under the single byte var int limit.
             nBytes += 2; // account for the serialized marker and flag bytes
             nBytes += nQuantity; // account for the witness byte that holds the number of stack items for each input.
         }
diff --git a/src/qt/forms/optionsdialog.ui b/src/qt/forms/optionsdialog.ui
index 0f1b3f4a73..14078b9ee8 100644
--- a/src/qt/forms/optionsdialog.ui
+++ b/src/qt/forms/optionsdialog.ui
@@ -315,7 +315,7 @@
             <bool>false</bool>
            </property>
            <property name="toolTip">
-            <string>Shows, if the supplied default SOCKS5 proxy is used to reach peers via this network type.</string>
+            <string>Shows if the supplied default SOCKS5 proxy is used to reach peers via this network type.</string>
            </property>
            <property name="text">
             <string/>
@@ -338,7 +338,7 @@
             <bool>false</bool>
            </property>
            <property name="toolTip">
-            <string>Shows, if the supplied default SOCKS5 proxy is used to reach peers via this network type.</string>
+            <string>Shows if the supplied default SOCKS5 proxy is used to reach peers via this network type.</string>
            </property>
            <property name="text">
             <string/>
@@ -361,7 +361,7 @@
             <bool>false</bool>
            </property>
            <property name="toolTip">
-            <string>Shows, if the supplied default SOCKS5 proxy is used to reach peers via this network type.</string>
+            <string>Shows if the supplied default SOCKS5 proxy is used to reach peers via this network type.</string>
            </property>
            <property name="text">
             <string/>
diff --git a/src/qt/modaloverlay.cpp b/src/qt/modaloverlay.cpp
index 4779ffa43f..a83f285034 100644
--- a/src/qt/modaloverlay.cpp
+++ b/src/qt/modaloverlay.cpp
@@ -126,7 +126,7 @@ void ModalOverlay::tipUpdate(int count, const QDateTime& blockDate, double nVeri
         return;
 
     // estimate the number of headers left based on nPowTargetSpacing
-    // and check if the gui is not aware of the the best header (happens rarely)
+    // and check if the gui is not aware of the best header (happens rarely)
     int estimateNumHeadersLeft = bestHeaderDate.secsTo(currentDate) / Params().GetConsensus().nPowTargetSpacing;
     bool hasBestHeader = bestHeaderHeight >= count;
 
diff --git a/src/qt/rpcconsole.cpp b/src/qt/rpcconsole.cpp
index b17693e1ca..ec0580b81c 100644
--- a/src/qt/rpcconsole.cpp
+++ b/src/qt/rpcconsole.cpp
@@ -672,7 +672,7 @@ void RPCConsole::setFontSize(int newSize)
 {
     QSettings settings;
 
-    //don't allow a insane font size
+    //don't allow an insane font size
     if (newSize < FONT_RANGE.width() || newSize > FONT_RANGE.height())
         return;
 
@@ -738,7 +738,7 @@ void RPCConsole::clear(bool clearHistory)
                         tr("Use up and down arrows to navigate history, and %1 to clear screen.").arg("<b>"+clsKey+"</b>") + "<br>" +
                         tr("Type <b>help</b> for an overview of available commands.")) +
                         "<br><span class=\"secwarning\">" +
-                        tr("WARNING: Scammers have been active, telling users to type commands here, stealing their wallet contents. Do not use this console without fully understanding the ramification of a command.") +
+                        tr("WARNING: Scammers have been active, telling users to type commands here, stealing their wallet contents. Do not use this console without fully understanding the ramifications of a command.") +
                         "</span>",
                         true);
 }
diff --git a/src/qt/walletmodel.cpp b/src/qt/walletmodel.cpp
index 449eb1ae58..6538a80233 100644
--- a/src/qt/walletmodel.cpp
+++ b/src/qt/walletmodel.cpp
@@ -339,7 +339,7 @@ WalletModel::SendCoinsReturn WalletModel::sendCoins(WalletModelTransaction &tran
         transaction_array.append(&(ssTx[0]), ssTx.size());
     }
 
-    // Add addresses / update labels that we've sent to to the address book,
+    // Add addresses / update labels that we've sent to the address book,
     // and emit coinsSent signal for each recipient
     for (const SendCoinsRecipient &rcp : transaction.getRecipients())
     {
diff --git a/src/rest.cpp b/src/rest.cpp
index 8fb0c13fa5..33e3fb4529 100644
--- a/src/rest.cpp
+++ b/src/rest.cpp
@@ -413,7 +413,7 @@ static bool rest_getutxos(HTTPRequest* req, const std::string& strURIPart)
         boost::split(uriParts, strUriParams, boost::is_any_of("/"));
     }
 
-    // throw exception in case of a empty request
+    // throw exception in case of an empty request
     std::string strRequestMutable = req->ReadBody();
     if (strRequestMutable.length() == 0 && uriParts.size() == 0)
         return RESTERR(req, HTTP_BAD_REQUEST, "Error: empty request");
diff --git a/src/rpc/net.cpp b/src/rpc/net.cpp
index d6f9f0059c..aecedb48b2 100644
--- a/src/rpc/net.cpp
+++ b/src/rpc/net.cpp
@@ -75,7 +75,7 @@ UniValue getpeerinfo(const JSONRPCRequest& request)
             "[\n"
             "  {\n"
             "    \"id\": n,                   (numeric) Peer index\n"
-            "    \"addr\":\"host:port\",      (string) The ip address and port of the peer\n"
+            "    \"addr\":\"host:port\",      (string) The IP address and port of the peer\n"
             "    \"addrbind\":\"ip:port\",    (string) Bind address of the connection to the peer\n"
             "    \"addrlocal\":\"ip:port\",   (string) Local address as reported by the peer\n"
             "    \"services\":\"xxxxxxxxxxxxxxxx\",   (string) The services offered\n"
@@ -199,7 +199,7 @@ UniValue addnode(const JSONRPCRequest& request)
         (strCommand != "onetry" && strCommand != "add" && strCommand != "remove"))
         throw std::runtime_error(
             "addnode \"node\" \"add|remove|onetry\"\n"
-            "\nAttempts add or remove a node from the addnode list.\n"
+            "\nAttempts to add or remove a node from the addnode list.\n"
             "Or try a connection to a node once.\n"
             "\nArguments:\n"
             "1. \"node\"     (string, required) The node (see getpeerinfo for nodes)\n"
@@ -290,7 +290,7 @@ UniValue getaddednodeinfo(const JSONRPCRequest& request)
             "\nResult:\n"
             "[\n"
             "  {\n"
-            "    \"addednode\" : \"192.168.0.201\",   (string) The node ip address or name (as provided to addnode)\n"
+            "    \"addednode\" : \"192.168.0.201\",   (string) The node IP address or name (as provided to addnode)\n"
             "    \"connected\" : true|false,          (boolean) If connected\n"
             "    \"addresses\" : [                    (list of objects) Only when connected = true\n"
             "       {\n"
@@ -497,12 +497,12 @@ UniValue setban(const JSONRPCRequest& request)
         (strCommand != "add" && strCommand != "remove"))
         throw std::runtime_error(
                             "setban \"subnet\" \"add|remove\" (bantime) (absolute)\n"
-                            "\nAttempts add or remove a IP/Subnet from the banned list.\n"
+                            "\nAttempts to add or remove an IP/Subnet from the banned list.\n"
                             "\nArguments:\n"
-                            "1. \"subnet\"       (string, required) The IP/Subnet (see getpeerinfo for nodes ip) with a optional netmask (default is /32 = single ip)\n"
-                            "2. \"command\"      (string, required) 'add' to add a IP/Subnet to the list, 'remove' to remove a IP/Subnet from the list\n"
-                            "3. \"bantime\"      (numeric, optional) time in seconds how long (or until when if [absolute] is set) the ip is banned (0 or empty means using the default time of 24h which can also be overwritten by the -bantime startup argument)\n"
-                            "4. \"absolute\"     (boolean, optional) If set, the bantime must be a absolute timestamp in seconds since epoch (Jan 1 1970 GMT)\n"
+                            "1. \"subnet\"       (string, required) The IP/Subnet (see getpeerinfo for nodes IP) with an optional netmask (default is /32 = single IP)\n"
+                            "2. \"command\"      (string, required) 'add' to add an IP/Subnet to the list, 'remove' to remove an IP/Subnet from the list\n"
+                            "3. \"bantime\"      (numeric, optional) time in seconds how long (or until when if [absolute] is set) the IP is banned (0 or empty means using the default time of 24h which can also be overwritten by the -bantime startup argument)\n"
+                            "4. \"absolute\"     (boolean, optional) If set, the bantime must be an absolute timestamp in seconds since epoch (Jan 1 1970 GMT)\n"
                             "\nExamples:\n"
                             + HelpExampleCli("setban", "\"192.168.0.6\" \"add\" 86400")
                             + HelpExampleCli("setban", "\"192.168.0.0/24\" \"add\"")
diff --git a/src/secp256k1/sage/group_prover.sage b/src/secp256k1/sage/group_prover.sage
index ab580c5b23..5198724bea 100644
--- a/src/secp256k1/sage/group_prover.sage
+++ b/src/secp256k1/sage/group_prover.sage
@@ -3,7 +3,7 @@
 # to independently set assumptions on input or intermediary variables.
 #
 # The general approach is:
-# * A constraint is a tuple of two sets of of symbolic expressions:
+# * A constraint is a tuple of two sets of symbolic expressions:
 #   the first of which are required to evaluate to zero, the second of which
 #   are required to evaluate to nonzero.
 #   - A constraint is said to be conflicting if any of its nonzero expressions
diff --git a/src/secp256k1/src/asm/field_10x26_arm.s b/src/secp256k1/src/asm/field_10x26_arm.s
index 5df561f2fc..bd2b629e1c 100644
--- a/src/secp256k1/src/asm/field_10x26_arm.s
+++ b/src/secp256k1/src/asm/field_10x26_arm.s
@@ -11,7 +11,7 @@ Note:
 
 - To avoid unnecessary loads and make use of available registers, two
   'passes' have every time been interleaved, with the odd passes accumulating c' and d' 
-  which will be added to c and d respectively in the the even passes
+  which will be added to c and d respectively in the even passes
 
 */
 
diff --git a/src/test/arith_uint256_tests.cpp b/src/test/arith_uint256_tests.cpp
index 45ae7d4636..2c98fbcfd6 100644
--- a/src/test/arith_uint256_tests.cpp
+++ b/src/test/arith_uint256_tests.cpp
@@ -219,7 +219,7 @@ BOOST_AUTO_TEST_CASE( unaryOperators ) // !    ~    -
 
 
 // Check if doing _A_ _OP_ _B_ results in the same as applying _OP_ onto each
-// element of Aarray and Barray, and then converting the result into a arith_uint256.
+// element of Aarray and Barray, and then converting the result into an arith_uint256.
 #define CHECKBITWISEOPERATOR(_A_,_B_,_OP_)                              \
     for (unsigned int i = 0; i < 32; ++i) { TmpArray[i] = _A_##Array[i] _OP_ _B_##Array[i]; } \
     BOOST_CHECK(arith_uint256V(std::vector<unsigned char>(TmpArray,TmpArray+32)) == (_A_##L _OP_ _B_##L));
diff --git a/src/test/data/script_tests.json b/src/test/data/script_tests.json
index e35a7ce569..0390d6806d 100644
--- a/src/test/data/script_tests.json
+++ b/src/test/data/script_tests.json
@@ -2506,7 +2506,7 @@
 ],
 
 ["CHECKSEQUENCEVERIFY tests"],
-["", "CHECKSEQUENCEVERIFY", "CHECKSEQUENCEVERIFY", "INVALID_STACK_OPERATION", "CSV automatically fails on a empty stack"],
+["", "CHECKSEQUENCEVERIFY", "CHECKSEQUENCEVERIFY", "INVALID_STACK_OPERATION", "CSV automatically fails on an empty stack"],
 ["-1", "CHECKSEQUENCEVERIFY", "CHECKSEQUENCEVERIFY", "NEGATIVE_LOCKTIME", "CSV automatically fails if stack top is negative"],
 ["0x0100", "CHECKSEQUENCEVERIFY", "CHECKSEQUENCEVERIFY,MINIMALDATA", "UNKNOWN_ERROR", "CSV fails if stack top is not minimally encoded"],
 ["0", "CHECKSEQUENCEVERIFY", "CHECKSEQUENCEVERIFY", "UNSATISFIED_LOCKTIME", "CSV fails if stack top bit 1 << 31 is set and the tx version < 2"],
diff --git a/src/test/data/tx_valid.json b/src/test/data/tx_valid.json
index d70fa54333..e6b382af13 100644
--- a/src/test/data/tx_valid.json
+++ b/src/test/data/tx_valid.json
@@ -174,7 +174,7 @@
 [[["5a6b0021a6042a686b6b94abc36b387bef9109847774e8b1e51eb8cc55c53921", 1, "DUP HASH160 0x14 0xee5a6aa40facefb2655ac23c0c28c57c65c41f9b EQUALVERIFY CHECKSIG"]],
 "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", "P2SH"],
 
-["Finally CHECKMULTISIG removes all signatures prior to hashing the script containing those signatures. In conjunction with the SIGHASH_SINGLE bug this lets us test whether or not FindAndDelete() is actually present in scriptPubKey/redeemScript evaluation by including a signature of the digest 0x01 We can compute in advance for our pubkey, embed it it in the scriptPubKey, and then also using a normal SIGHASH_ALL signature. If FindAndDelete() wasn't run, the 'bugged' signature would still be in the hashed script, and the normal signature would fail."],
+["Finally CHECKMULTISIG removes all signatures prior to hashing the script containing those signatures. In conjunction with the SIGHASH_SINGLE bug this lets us test whether or not FindAndDelete() is actually present in scriptPubKey/redeemScript evaluation by including a signature of the digest 0x01 We can compute in advance for our pubkey, embed it in the scriptPubKey, and then also using a normal SIGHASH_ALL signature. If FindAndDelete() wasn't run, the 'bugged' signature would still be in the hashed script, and the normal signature would fail."],
 
 ["Here's an example on mainnet within a P2SH redeemScript. Remarkably it's a standard transaction in <0.9"],
 [[["b5b598de91787439afd5938116654e0b16b7a0d0f82742ba37564219c5afcbf9", 0, "DUP HASH160 0x14 0xf6f365c40f0739b61de827a44751e5e99032ed8f EQUALVERIFY CHECKSIG"],
diff --git a/src/torcontrol.cpp b/src/torcontrol.cpp
index eb0722cd81..4cd64bf028 100644
--- a/src/torcontrol.cpp
+++ b/src/torcontrol.cpp
@@ -407,7 +407,7 @@ static bool WriteBinaryFile(const fs::path &filename, const std::string &data)
 /****** Bitcoin specific TorController implementation ********/
 
 /** Controller that connects to Tor control socket, authenticate, then create
- * and maintain a ephemeral hidden service.
+ * and maintain an ephemeral hidden service.
  */
 class TorController
 {
diff --git a/src/txmempool.cpp b/src/txmempool.cpp
index afafc695f4..bb03e05460 100644
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -122,7 +122,7 @@ void CTxMemPool::UpdateTransactionsFromBlock(const std::vector<uint256> &vHashes
     // accounted for in the state of their ancestors)
     std::set<uint256> setAlreadyIncluded(vHashesToUpdate.begin(), vHashesToUpdate.end());
 
-    // Iterate in reverse, so that whenever we are looking at at a transaction
+    // Iterate in reverse, so that whenever we are looking at a transaction
     // we are sure that all in-mempool descendants have already been processed.
     // This maximizes the benefit of the descendant cache and guarantees that
     // setMemPoolChildren will be updated, an assumption made in
diff --git a/src/utilstrencodings.cpp b/src/utilstrencodings.cpp
index 74bf66fbf6..93abaec04b 100644
--- a/src/utilstrencodings.cpp
+++ b/src/utilstrencodings.cpp
@@ -437,7 +437,7 @@ bool ParseInt32(const std::string& str, int32_t *out)
     errno = 0; // strtol will not set errno if valid
     long int n = strtol(str.c_str(), &endp, 10);
     if(out) *out = (int32_t)n;
-    // Note that strtol returns a *long int*, so even if strtol doesn't report a over/underflow
+    // Note that strtol returns a *long int*, so even if strtol doesn't report an over/underflow
     // we still have to check that the returned value is within the range of an *int32_t*. On 64-bit
     // platforms the size of these types may be different.
     return endp && *endp == 0 && !errno &&
@@ -453,7 +453,7 @@ bool ParseInt64(const std::string& str, int64_t *out)
     errno = 0; // strtoll will not set errno if valid
     long long int n = strtoll(str.c_str(), &endp, 10);
     if(out) *out = (int64_t)n;
-    // Note that strtoll returns a *long long int*, so even if strtol doesn't report a over/underflow
+    // Note that strtoll returns a *long long int*, so even if strtol doesn't report an over/underflow
     // we still have to check that the returned value is within the range of an *int64_t*.
     return endp && *endp == 0 && !errno &&
         n >= std::numeric_limits<int64_t>::min() &&
@@ -470,7 +470,7 @@ bool ParseUInt32(const std::string& str, uint32_t *out)
     errno = 0; // strtoul will not set errno if valid
     unsigned long int n = strtoul(str.c_str(), &endp, 10);
     if(out) *out = (uint32_t)n;
-    // Note that strtoul returns a *unsigned long int*, so even if it doesn't report a over/underflow
+    // Note that strtoul returns a *unsigned long int*, so even if it doesn't report an over/underflow
     // we still have to check that the returned value is within the range of an *uint32_t*. On 64-bit
     // platforms the size of these types may be different.
     return endp && *endp == 0 && !errno &&
@@ -487,7 +487,7 @@ bool ParseUInt64(const std::string& str, uint64_t *out)
     errno = 0; // strtoull will not set errno if valid
     unsigned long long int n = strtoull(str.c_str(), &endp, 10);
     if(out) *out = (uint64_t)n;
-    // Note that strtoull returns a *unsigned long long int*, so even if it doesn't report a over/underflow
+    // Note that strtoull returns a *unsigned long long int*, so even if it doesn't report an over/underflow
     // we still have to check that the returned value is within the range of an *uint64_t*.
     return endp && *endp == 0 && !errno &&
         n <= std::numeric_limits<uint64_t>::max();
diff --git a/src/validation.cpp b/src/validation.cpp
index bef17337b9..7b40447de6 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -1206,7 +1206,7 @@ static bool CheckInputs(const CTransaction& tx, CValidationState &state, const C
                             return state.Invalid(false, REJECT_NONSTANDARD, strprintf("non-mandatory-script-verify-flag (%s)", ScriptErrorString(check.GetScriptError())));
                     }
                     // Failures of other flags indicate a transaction that is
-                    // invalid in new blocks, e.g. a invalid P2SH. We DoS ban
+                    // invalid in new blocks, e.g. an invalid P2SH. We DoS ban
                     // such nodes as they are not following the protocol. That
                     // said during an upgrade careful thought should be taken
                     // as to the correct behavior - we may want to continue
diff --git a/src/wallet/rpcdump.cpp b/src/wallet/rpcdump.cpp
index 3c25364648..09aaf4f747 100644
--- a/src/wallet/rpcdump.cpp
+++ b/src/wallet/rpcdump.cpp
@@ -1049,7 +1049,7 @@ UniValue importmulti(const JSONRPCRequest& mainRequest)
             "      \"redeemscript\": \"<script>\"                            , (string, optional) Allowed only if the scriptPubKey is a P2SH address or a P2SH scriptPubKey\n"
             "      \"pubkeys\": [\"<pubKey>\", ... ]                         , (array, optional) Array of strings giving pubkeys that must occur in the output or redeemscript\n"
             "      \"keys\": [\"<key>\", ... ]                               , (array, optional) Array of strings giving private keys whose corresponding public keys must occur in the output or redeemscript\n"
-            "      \"internal\": <true>                                    , (boolean, optional, default: false) Stating whether matching outputs should be be treated as not incoming payments\n"
+            "      \"internal\": <true>                                    , (boolean, optional, default: false) Stating whether matching outputs should be treated as not incoming payments\n"
             "      \"watchonly\": <true>                                   , (boolean, optional, default: false) Stating whether matching outputs should be considered watched even when they're not spendable, only allowed if keys are empty\n"
             "      \"label\": <label>                                      , (string, optional, default: '') Label to assign to the address (aka account name, for now), only allowed with internal=false\n"
             "    }\n"
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 2c5c38eb94..c94f337b26 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -3866,11 +3866,11 @@ CWallet* CWallet::CreateWalletFromFile(const std::string walletFile)
     else if (IsArgSet("-usehd")) {
         bool useHD = GetBoolArg("-usehd", DEFAULT_USE_HD_WALLET);
         if (walletInstance->IsHDEnabled() && !useHD) {
-            InitError(strprintf(_("Error loading %s: You can't disable HD on a already existing HD wallet"), walletFile));
+            InitError(strprintf(_("Error loading %s: You can't disable HD on an already existing HD wallet"), walletFile));
             return NULL;
         }
         if (!walletInstance->IsHDEnabled() && useHD) {
-            InitError(strprintf(_("Error loading %s: You can't enable HD on a already existing non-HD wallet"), walletFile));
+            InitError(strprintf(_("Error loading %s: You can't enable HD on an already existing non-HD wallet"), walletFile));
             return NULL;
         }
     }
@@ -3890,7 +3890,7 @@ CWallet* CWallet::CreateWalletFromFile(const std::string walletFile)
     if (chainActive.Tip() && chainActive.Tip() != pindexRescan)
     {
         //We can't rescan beyond non-pruned blocks, stop and throw an error
-        //this might happen if a user uses a old wallet within a pruned node
+        //this might happen if a user uses an old wallet within a pruned node
         // or if he ran -disablewallet for a longer time, then decided to re-enable
         if (fPruneMode)
         {