diff --git a/diffLib.js b/diffLib.js
index e60f060..69d4f49 100644
--- a/diffLib.js
+++ b/diffLib.js
@@ -6,18 +6,13 @@ var applyDiff = function(oldStr, diff) {
         }
 }
 
-var makeDiff = function(oldStr, newStr) {
-        if (oldStr.length > newStr.length) return makeDel(oldStr,newStr);
-        else return makeInsert(oldStr,newStr);
-}
-
 var makeDiffList = function(oldStr, newStr) {
         if (oldStr === newStr) return [];
         res = [];
         // i := the number of equal chars at the beginning of the strings
         for(var i = 0 ; i< oldStr.length && i< newStr.length && oldStr[i]===newStr[i] ; i++) {}
         // j := the number of equal chars at the end of the strings
-        for(var j = 0 ; j< oldStr.length && j< newStr.length && oldStr[oldStr.length-j-1]===newStr[newStr.length-j-1] ; j++) {}
+        for(var j = 0 ; j< oldStr.length - i && j< newStr.length - i && oldStr[oldStr.length-j-1]===newStr[newStr.length-j-1] ; j++) {}
         if(i+j!==oldStr.length) {
                 // Some stuff was deleted from oldStr
                 res.push({type:"delete",point:i,length:(oldStr.length-i-j)});
@@ -29,29 +24,6 @@ var makeDiffList = function(oldStr, newStr) {
         return res;
 }
 
-// Requires that oldStr be the same as newStr, but missing a single contiguous block.
-// \exists s1,s2,s3 st oldStr === s1+s3 ^ newStr === s1+s2+s3
-var makeInsert = function(oldStr, newStr) {
-        var res = {type:"insert", content:""};
-        for(var i = 0 ; oldStr[i]===newStr[i] && i<newStr.length ; i++) { }
-        res.point = i;
-        for( ; oldStr[res.point]!==newStr[i] && i<newStr.length ; i++) {
-                res.content+=newStr[i];
-        }
-        // Assert: newStr.length - oldStr.length === i - res.point
-        return res;
-}
-
-// Requires that oldStr be the same as newStr, but with one extra char.
-// \exists s1,s2,s3 st oldStr === s1+s2+s3 ^ newStr === s1+s3 ^ len(s2)===1
-var makeDel = function(oldStr, newStr) {
-        var res = {type:"delete", length:1}
-        for(var i = 0 ; oldStr[i]===newStr[i] && i<newStr.length ; i++) { }
-        res.point = i;
-        // Assert: newStr.length - oldStr.length === i - res.point
-        return res;
-}
-
 // Tells you if two diffs clash footprints
 var isClash = function(d1,d2) {
         var d1fp = {start:d1.point, end:d1.point};
@@ -71,9 +43,6 @@ var updateAafterB = function(d1,d2) {
 
 if(typeof(exports)!=='undefined') {
         exports.applyDiff = applyDiff;
-        exports.makeDiff = makeDiff;
-        exports.makeInsert = makeInsert;
-        exports.makeDel = makeDel;
         exports.isClash = isClash;
         exports.updateAafterB = updateAafterB;
         exports.makeDiffList = makeDiffList;
diff --git a/server.js b/server.js
index 5212ef4..1b2a05d 100644
--- a/server.js
+++ b/server.js
@@ -20,10 +20,11 @@ var handleReq = function(req, res) {
         } else if(req.url.match(/^\/getDoc/)) {
                 res.writeHead(200, {'Content-Type': 'text/json'});
                 res.end(JSON.stringify([doc,++lastUser]));
+                changeLog[lastUser] = [];
         } else if(df = req.url.match(/^\/getDiff\?(.*)/)) {
                 var uid = unescape(df[1]);
                 var mydiffs = changeLog[uid];
-                res.writeHead(200, {'Content-Type': 'text/plain'});
+                res.writeHead(200, {'Content-Type': 'text/json'});
                 res.end(JSON.stringify(mydiffs));
                 changeLog[uid] = [];
         } else if(df = req.url.match(/^\/putDiff\?(.*)/)) {
@@ -63,5 +64,3 @@ var applyConcurrentDiff = function(df) {
 }
 
 http.createServer(handleReq).listen(4242,"127.0.0.1")
-
-