Minecraft wiki entry for Witch_farming, associated text: 9 Stacks of Building Blocks
2 Stacks of Slab Blocks
27 Trapdoors of any type
54 Redstone Dust
3 Redstone Torches
42 Tripwire hooks
3 Stacks of String
2 Water Buckets
18 Buttons (for Spawn Protection)
1 Sign