Witch Farm [Tutorial] works in Minecraft 1.12

I asked you if you wanted to see a Tutorial for this Witch Farm from the Ultimate Base! Here it is!\r
Note: Putting Halfslabs on Redstone is not needed anymore in Minecraft 1.9. Mobs cant Spawn on Halfslabs!\r
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I am currently Playing in:\r
Minecraft 1.8.4, Minecraft 1.8.8, Minecraft 1.9