diff --git a/2016/d25/ex2/input b/2016/d25/ex2/input
index 7a978f6..199164f 100644
--- a/2016/d25/ex2/input
+++ b/2016/d25/ex2/input
@@ -1,30 +1,62 @@
-cpy a d
-cpy 15 c
-cpy 170 b
-inc d
-dec b
-jnz b -2
-dec c
-jnz c -5
-cpy d a
-jnz 0 0
-cpy a b
-cpy 0 a
-cpy 2 c
-jnz b 2
-jnz 1 6
-dec b
-dec c
-jnz c -4
-inc a
-jnz 1 -7
-cpy 2 b
-jnz c 2
-jnz 1 4
-dec b
-dec c
-jnz 1 -4
-jnz 0 0
-out b
-jnz a -19
-jnz 1 -21
+Begin in state A.
+Perform a diagnostic checksum after 12683008 steps.
+
+In state A:
+  If the current value is 0:
+    - Write the value 1.
+    - Move one slot to the right.
+    - Continue with state B.
+  If the current value is 1:
+    - Write the value 0.
+    - Move one slot to the left.
+    - Continue with state B.
+
+In state B:
+  If the current value is 0:
+    - Write the value 1.
+    - Move one slot to the left.
+    - Continue with state C.
+  If the current value is 1:
+    - Write the value 0.
+    - Move one slot to the right.
+    - Continue with state E.
+
+In state C:
+  If the current value is 0:
+    - Write the value 1.
+    - Move one slot to the right.
+    - Continue with state E.
+  If the current value is 1:
+    - Write the value 0.
+    - Move one slot to the left.
+    - Continue with state D.
+
+In state D:
+  If the current value is 0:
+    - Write the value 1.
+    - Move one slot to the left.
+    - Continue with state A.
+  If the current value is 1:
+    - Write the value 1.
+    - Move one slot to the left.
+    - Continue with state A.
+
+In state E:
+  If the current value is 0:
+    - Write the value 0.
+    - Move one slot to the right.
+    - Continue with state A.
+  If the current value is 1:
+    - Write the value 0.
+    - Move one slot to the right.
+    - Continue with state F.
+
+In state F:
+  If the current value is 0:
+    - Write the value 1.
+    - Move one slot to the right.
+    - Continue with state E.
+  If the current value is 1:
+    - Write the value 1.
+    - Move one slot to the right.
+    - Continue with state A.