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FOR BLOWING UP STUFF!

Step 1: What You need

All you need is a half-block, any kind of whole block, a redstone repeater, redstone, a leaver/button. T.N.T and a bucket of water.
<p>hmm... might start a collection of TNT cannons... unless someone knows of one that already exists?</p>
FYI:its called a slab!:)
Awesome Instructable!!! <br>Helped me tons!!!! <br>THANKS!!!!

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