diff --git a/18/0 b/18/0
deleted file mode 100644
index 7ed6ff8..0000000
--- a/18/0
+++ /dev/null
@@ -1 +0,0 @@
-5
diff --git a/18/18.awk b/18/18.awk
index 9186a2b..54e1dc8 100644
--- a/18/18.awk
+++ b/18/18.awk
@@ -9,7 +9,7 @@ function parse( s ){
 		else if(s~/^\]/){ # ]
 			l = sl[slp--]
 			r = pindex
-			print "left",l,"right",r
+#			print "left",l,"right",r
 			num[++pindex] = -1
 			ile[pindex] = l
 			iri[pindex] = r
@@ -22,6 +22,13 @@ function parse( s ){
 	}
 }
 
+function cleanparse(s){
+	delete ile; delete iri; delete num; delete sl
+	slp = 0
+	pindex = 0
+	parse(s)
+}
+
 function parent(id){
 	for(i in ile)
 		if(ile[i]==id || iri[i]==id) return i
@@ -50,14 +57,14 @@ function treetostring(id){
 function leftitemi(id){
 	do{
 		id--
-	}while(num[id]<0 && id>0)
+	}while((num[id]<0 && id>0))
 	return id
 }
 
 function rightitemi(id){
 	do{
 		id++
-	}while(num[id]<0 && id<=length(num))
+	}while((num[id]<0 && id<=length(num)))
 	return id
 }
 
@@ -79,8 +86,8 @@ function explode(id){
 }
 
 function toexplode(){
-	for(id=1;id<=length(num);id++){
-		if((num[id]>0) && (levels(id)>4)) return id
+	for(id=1;id<=pindex;id++){
+		if((num[id]>=0) && (levels(id)>4) && num[parent(id)]<0) return id
 	}
 	return -1
 }
@@ -97,25 +104,65 @@ function dosplit(id){
 }
 function tosplit(){
 	for(id=1;id<=pindex;id++){
-		print id, (num[id]-10>0), num[id]
-		if((num[id]-10>0)) return id
+#		print id, (num[id]-10>0), num[id]
+		if((num[id]-10>=0) && num[parent(id)]<0 ) return id
 	}
 	return -1
 }
 
+function reduce(){
+	do{
+		ind = toexplode()
+		print "explode?", ind, num[ind], parent(ind), num[parent(ind)],num[leftitemi(ind)]
+
+		if(ind>0){
+			explode(ind)
+			print "exploded", treetostring(root)
+			s = treetostring(root)
+			cleanparse(s)
+#			print "to split?",tosplit()
+			continue
+		}
+		ind = tosplit()
+		print "split?", ind, num[ind], parent(ind), num[parent(ind)], ile[parent(ind)], iri[parent(ind)]
+		if(ind>0){
+			dosplit(ind)
+			print "split", treetostring(root)
+			s = treetostring(root)
+			cleanparse(s)
+		}
+		print toexplode(), tosplit()
+	} while( ((toexplode()>0) || (tosplit()>0)) )
+	print "done"
+}
+
+function magnitude(id){
+	if(num[id]>=0) return num[id] # regular number
+	# node
+	return magnitude(ile[id])*3 + magnitude(iri[id])*2
+}
+
 BEGIN{ pindex = 0 }
 
-{
-	parse( $0 )
-	if(NR>1){
-		num[++pindex] = -1
-		ile[pindex] = proot
-		iri[pindex] = root
-		root = pindex
-	}
+NR==1{
+	parse($0)
 	proot = root
 }
 
+NR>1{
+	parse( $0 )
+	num[++pindex] = -1
+	ile[pindex] = proot
+	iri[pindex] = root
+	root = pindex
+	print "raw add",NR, treetostring(root)
+	reduce()
+	s = treetostring(root)
+	cleanparse(s)
+	proot = root
+	print "after",NR,treetostring(root)
+}
+
 END{
 	OFS=":"
 	print pindex, root
@@ -128,27 +175,14 @@ END{
 
 #	print num[1], "is at",levels(1),"levels"
 
+	s = treetostring(root)
+	cleanparse(s)
 	print treetostring(root)
 
-	c = 0;
-	do{
-		ind = toexplode()
-		print "explode?", ind
+	reduce()
 
-		if(ind>0){
-			explode(ind)
-			print "exploded"
-		}
-		ind = tosplit()
-		print "split?", ind
-		if(ind>0){
-			dosplit(ind)
-			print "split"
-		}
-		print treetostring(root)
-		c++
-		print toexplode(), tosplit(), c
-	} while(  ((toexplode()>0) || (tosplit()>0)) )
-	print "done"
+	print treetostring(root)
+
+	print magnitude(root)
 
 }
diff --git a/18/6 b/18/6
deleted file mode 100644
index 3f10ffe..0000000
--- a/18/6
+++ /dev/null
@@ -1 +0,0 @@
-15
\ No newline at end of file