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from Brown Corpus
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When cutting the pieces, dress the ends smooth, and square with a smooth file or sanding disk.
Start with the right-hand piece `` B '', Af, soldering it to the lower piece `` A '' of the same material but 12'' '' long.
Let exactly 1'' '' of `` A '' extend beyond `` B '' and use a square to check your angle to exactly 90 degrees.

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