Parapet is a donation TSD/TSS technique which got its name because of how the J-Block covering the hole resembles a parapet. You can preserve the lines underneath with this technique, which often leads to situations where you can immediately follow up with a Tetris.
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You can also forgo the TSD for a TSS. It is useful when you do not have the initial height to make a Tetris because it preserves one more line in your stack.
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