Index: graphspell/ibdawg.py
==================================================================
--- graphspell/ibdawg.py
+++ graphspell/ibdawg.py
@@ -147,11 +147,11 @@
             raise ValueError("# Error. Unknown dictionary version: {}".format(self.by[17:18]))
         try:
             header, info, values, bdic = self.by.split(b"\0\0\0\0", 3)
         except Exception:
             raise Exception
-        
+
         self.nCompressionMethod = int(self.by[17:18].decode("utf-8"))
         self.sHeader = header.decode("utf-8")
         self.lArcVal = values.decode("utf-8").split("\t")
         self.nArcVal = len(self.lArcVal)
         self.byDic = bdic
@@ -479,11 +479,11 @@
             while not (nRawArc & self._lastArcMask):
                 iEndArcAddr = iAddr + self.nBytesArc
                 nRawArc = int.from_bytes(self.byDic[iAddr:iEndArcAddr], byteorder='big')
                 nArc = nRawArc & self._arcMask
                 if nArc > self.nChar:
-                    # This value is not a char, this is a stemming code 
+                    # This value is not a char, this is a stemming code
                     sStem = ">" + self.funcStemming(sWord, self.lArcVal[nArc])
                     # Now , we go to the next node and retrieve all following arcs values, all of them are tags
                     iAddr2 = int.from_bytes(self.byDic[iEndArcAddr:iEndArcAddr+self.nBytesNodeAddress], byteorder='big')
                     nRawArc2 = 0
                     while not (nRawArc2 & self._lastArcMask):
@@ -510,11 +510,11 @@
             while not (nRawArc & self._lastArcMask):
                 iEndArcAddr = iAddr + self.nBytesArc
                 nRawArc = int.from_bytes(self.byDic[iAddr:iEndArcAddr], byteorder='big')
                 nArc = nRawArc & self._arcMask
                 if nArc > self.nChar:
-                    # This value is not a char, this is a stemming code 
+                    # This value is not a char, this is a stemming code
                     l.append(self.funcStemming(sWord, self.lArcVal[nArc]))
                 iAddr = iEndArcAddr+self.nBytesNodeAddress
             return l
         return []
 
@@ -522,11 +522,11 @@
         "looks if <nVal> is an arc at the node at <iAddr>, if yes, returns address of next node else None"
         while True:
             iEndArcAddr = iAddr+self.nBytesArc
             nRawArc = int.from_bytes(self.byDic[iAddr:iEndArcAddr], byteorder='big')
             if nVal == (nRawArc & self._arcMask):
-                # the value we are looking for 
+                # the value we are looking for
                 # we return the address of the next node
                 return int.from_bytes(self.byDic[iEndArcAddr:iEndArcAddr+self.nBytesNodeAddress], byteorder='big')
             else:
                 # value not found
                 if (nRawArc & self._lastArcMask):
@@ -577,11 +577,11 @@
             while not (nRawArc & self._lastArcMask):
                 iEndArcAddr = iAddr + self.nBytesArc
                 nRawArc = int.from_bytes(self.byDic[iAddr:iEndArcAddr], byteorder='big')
                 nArc = nRawArc & self._arcMask
                 if nArc > self.nChar:
-                    # This value is not a char, this is a stemming code 
+                    # This value is not a char, this is a stemming code
                     sStem = ">" + self.funcStemming(sWord, self.lArcVal[nArc])
                     # Now , we go to the next node and retrieve all following arcs values, all of them are tags
                     if not (nRawArc & self._addrBitMask):
                         iAddr2 = int.from_bytes(self.byDic[iEndArcAddr:iEndArcAddr+self.nBytesNodeAddress], byteorder='big')
                     else:
@@ -615,11 +615,11 @@
             while not (nRawArc & self._lastArcMask):
                 iEndArcAddr = iAddr + self.nBytesArc
                 nRawArc = int.from_bytes(self.byDic[iAddr:iEndArcAddr], byteorder='big')
                 nArc = nRawArc & self._arcMask
                 if nArc > self.nChar:
-                    # This value is not a char, this is a stemming code 
+                    # This value is not a char, this is a stemming code
                     l.append(self.funcStemming(sWord, self.lArcVal[nArc]))
                     # Now , we go to the next node
                     if not (nRawArc & self._addrBitMask):
                         iAddr2 = int.from_bytes(self.byDic[iEndArcAddr:iEndArcAddr+self.nBytesNodeAddress], byteorder='big')
                     else:
@@ -636,11 +636,11 @@
         "looks if <nVal> is an arc at the node at <iAddr>, if yes, returns address of next node else None"
         while True:
             iEndArcAddr = iAddr+self.nBytesArc
             nRawArc = int.from_bytes(self.byDic[iAddr:iEndArcAddr], byteorder='big')
             if nVal == (nRawArc & self._arcMask):
-                # the value we are looking for 
+                # the value we are looking for
                 if not (nRawArc & self._addrBitMask):
                     # we return the address of the next node
                     return int.from_bytes(self.byDic[iEndArcAddr:iEndArcAddr+self.nBytesNodeAddress], byteorder='big')
                 else:
                     # we go to the end of the node
@@ -693,11 +693,11 @@
             while not (nRawArc & self._lastArcMask):
                 iEndArcAddr = iAddr + self.nBytesArc
                 nRawArc = int.from_bytes(self.byDic[iAddr:iEndArcAddr], byteorder='big')
                 nArc = nRawArc & self._arcMask
                 if nArc > self.nChar:
-                    # This value is not a char, this is a stemming code 
+                    # This value is not a char, this is a stemming code
                     sStem = ">" + self.funcStemming(sWord, self.lArcVal[nArc])
                     # Now , we go to the next node and retrieve all following arcs values, all of them are tags
                     if not (nRawArc & self._addrBitMask):
                         iAddr2 = int.from_bytes(self.byDic[iEndArcAddr:iEndArcAddr+self.nBytesNodeAddress], byteorder='big')
                     else:
@@ -728,11 +728,11 @@
             while not (nRawArc & self._lastArcMask):
                 iEndArcAddr = iAddr + self.nBytesArc
                 nRawArc = int.from_bytes(self.byDic[iAddr:iEndArcAddr], byteorder='big')
                 nArc = nRawArc & self._arcMask
                 if nArc > self.nChar:
-                    # This value is not a char, this is a stemming code 
+                    # This value is not a char, this is a stemming code
                     l.append(self.funcStemming(sWord, self.lArcVal[nArc]))
                 iAddr = iEndArcAddr+self.nBytesNodeAddress  if not (nRawArc & self._addrBitMask)  else iEndArcAddr+self.nBytesOffset
             return l
         return []
 
@@ -741,11 +741,11 @@
         iAddrNode = iAddr
         while True:
             iEndArcAddr = iAddr+self.nBytesArc
             nRawArc = int.from_bytes(self.byDic[iAddr:iEndArcAddr], byteorder='big')
             if nVal == (nRawArc & self._arcMask):
-                # the value we are looking for 
+                # the value we are looking for
                 if not (nRawArc & self._addrBitMask):
                     return int.from_bytes(self.byDic[iEndArcAddr:iEndArcAddr+self.nBytesNodeAddress], byteorder='big')
                 else:
                     return iAddrNode + int.from_bytes(self.byDic[iEndArcAddr:iEndArcAddr+self.nBytesOffset], byteorder='big')
             else: