diff --git a/copy.json b/copy.json
new file mode 100644
index 0000000..ae4536b
--- /dev/null
+++ b/copy.json
@@ -0,0 +1,37 @@
+{
+	"rules": {
+		"start": [
+			{
+				"rule": "copy"
+			}
+		],
+		"copy": [
+			{
+				"state": [
+					"01",
+					" "
+				],
+				"move": [
+					1,
+					1
+				],
+				"mod": [
+					"$0",
+					"$0"
+				]
+			},
+			{
+				"state": [
+					" ",
+					" "
+				],
+				"rule": "done",
+				"move": [
+					0,
+					-1
+				]
+			}
+		]
+	},
+	"lines": 2
+}
diff --git a/copy.turingmachine b/copy.turingmachine
new file mode 100644
index 0000000..4d553f0
--- /dev/null
+++ b/copy.turingmachine
@@ -0,0 +1,12 @@
+init: copy
+accept: done
+
+copy,0,_
+copy,0,0,>,>
+
+copy,1,_
+copy,1,1,>,>
+
+copy,_,_
+done,_,_,-,<
+
diff --git a/turing.py b/turing.py
index 177a9d9..aaee119 100644
--- a/turing.py
+++ b/turing.py
@@ -30,6 +30,8 @@ def step(self):
 				if a!=b: # check if this rule fits
 					if a=='*':
 						pass
+					elif b in a:
+						pass
 					else:
 						break
 			else: # rule is ok
@@ -37,17 +39,23 @@ def step(self):
 				break
 		else: # rule not found
 			self.state=2
-			raise RuntimeError('invalid state', rule_set, state)
+			raise RuntimeError('invalid state', rule_set, state, self.rule)
 
 		mod=todo.get('mod', [None]*self.lines)
+		realmod=[]
 		motion=todo.get('move', [0]*self.lines)
 		for i in range(self.lines): # edit all of the lines
-			self.data[i].set(mod[i], motion[i])
+			val=mod[i]
+			if val!=None and val.startswith('$'):
+				val=self.data[int(val[1:])].get()
+			realmod.append(val if val!=None else self.data[i].get())
+			self.data[i].set(val)
+		[self.data[i].move(motion[i]) for i in range(self.lines)]
 		self.rule=todo.get('rule', self.rule)
 
 		if self.rule=='done':
 			self.state=1
-		return (self.rule, mod, motion)
+		return (self.rule, mod, realmod, motion)
 
 class line:
 	def __init__(self, data=[], head=0):
@@ -128,7 +136,9 @@ def load_rule(file='rules.json'):
 	try:
 		steps=0
 		while not machine.state:
-			machine.step()
+			info=machine.step()
+			if False: # to enable debug set to True
+				print(info)
 			steps+=1
 	except KeyboardInterrupt:
 		print(machine.data, machine.state, machine.rule)
@@ -141,7 +151,7 @@ def load_rule(file='rules.json'):
 				print('empty')
 				continue
 			print(str().join([line.data.get(i, ' ') for i in range(min(buf), max(buf)+1)]))
-		print('head:', steps)
+		print('steps:', steps)
 #		print([list(i.data.values()) for i in machine.data])
 #		print(machine.data)
 #	print(machine.data)