diff --git a/assets/99.bas b/assets/99.bas
index 3cf2950..3d195a1 100644
--- a/assets/99.bas
+++ b/assets/99.bas
@@ -1,9 +1,7 @@
 1 FOR I = 99 TO 1
-2   (MODE = 1)
-3   (GOSUB 12)
+2   (MODE = 1):(GOSUB 12)
 4   PRINT(I+" bottle"+BOTTLES$+" of beer on the wall, "+i+" bottle"+BOTTLES$+" of beer.")
-5   (MODE = 2)
-6   (GOSUB 12)
+5   (MODE = 2):(GOSUB 12)
 7   PRINT("Take one down and pass it around, "+(i-1)+" bottle"+BOTTLES$+" of beer on the wall.")
 8 NEXT
 9 PRINT "No more bottles of beer on the wall, no more bottles of beer."
diff --git a/assets/basic.js b/assets/basic.js
index 898a073..8dd53a8 100644
--- a/assets/basic.js
+++ b/assets/basic.js
@@ -422,7 +422,7 @@ if no arg text were given (e.g. "10 NEXT"), args will have zero length
     });
 },
 ":" : function(lnum, args) { // functional sequence
-    // just do nothing
+    // TODO alternative method of impl: make syntax tree to have two or more consequent command "roots" and execute from there
 },
 "+" : function(lnum, args) { // addition, string concat
     return twoArg(lnum, args, function(lh, rh) { return lh + rh; });
@@ -532,13 +532,14 @@ if no arg text were given (e.g. "10 NEXT"), args will have zero length
     return oneArgNum(lnum, args, function(lh) {
         if (lh < 0) throw lang.syntaxfehler(lnum, lh);
         bStatus.gosubStack.push(lnum + 1);
+        println(lnum+" GOSUB into "+lh);
         return lh;
     });
 },
 "RETURN" : function(lnum, args) {
     var r = bStatus.gosubStack.pop();
     if (r === undefined) throw lang.nowhereToReturn(lnum);
-    serial.println(lnum+" RETURN to "+r);
+    println(lnum+" RETURN to "+r);
     return r;
 },
 "CLEAR" : function(lnum, args) {