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FOR BLOWING UP STUFF!
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.
You need to have a seven block line, and one next to it and joining it on with a block at the end.
Add stairs one block away from the conjoining block, and keep adding on.
Put the half-block at the end of the 7 blocks.
Put the water where you started the stairs, it should stop at the half block.
Put the redstone on the seven blocks as shown.
Put the repeaters in the gaps on the right.
Add the leaver at the bottom where you connected the redstone.
Add tnt from the stairs to the end, to finish!
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