Index: graphspell-js/dawg.js
==================================================================
--- graphspell-js/dawg.js
+++ graphspell-js/dawg.js
@@ -383,15 +383,11 @@
             "nArc": this.nArc,
             "nAff": this.nAff,
             "cStemming": this.cStemming,
             "nTag": this.nTag,
             "dChar": helpers.mapToObject(this.dChar),
-            "_arcMask": this._arcMask,
-            "_finalNodeMask": this._finalNodeMask,
-            "_lastArcMask": this._lastArcMask,
-            "_addrBitMask": this._addrBitMask,
-            "nBytesOffset": this.nBytesOffset
+            "nBytesOffset": 1
         };
         return oJSON;
     }
 }
 

Index: graphspell-js/ibdawg.js
==================================================================
--- graphspell-js/ibdawg.js
+++ graphspell-js/ibdawg.js
@@ -135,10 +135,15 @@
         } else if (this.cStemming == "A") {
             this.funcStemming = str_transform.changeWordWithAffixCode;
         } else {
             this.funcStemming = str_transform.noStemming;
         }
+
+        this._arcMask = (2 ** ((this.nBytesArc * 8) - 3)) - 1;
+        this._finalNodeMask = 1 << ((this.nBytesArc * 8) - 1);
+        this._lastArcMask = 1 << ((this.nBytesArc * 8) - 2);
+
 
         // Configuring DAWG functions according to nVersion
         switch (this.nVersion) {
             case 1:
                 this.morph = this._morph1;

Index: graphspell/ibdawg.py
==================================================================
--- graphspell/ibdawg.py
+++ graphspell/ibdawg.py
@@ -184,14 +184,10 @@
                             "nArc": self.nArc,
                             "nAff": self.nAff,
                             "cStemming": self.cStemming,
                             "nTag": self.nTag,
                             "dChar": self.dChar,
-                            "_arcMask": self._arcMask,
-                            "_finalNodeMask": self._finalNodeMask,
-                            "_lastArcMask": self._lastArcMask,
-                            "_addrBitMask": self._addrBitMask,
                             "nBytesOffset": self.nBytesOffset
                         }, ensure_ascii=False))
             if bInJSModule:
                 hDst.write(";\n\nexports.dictionary = dictionary;\n")