View source for Pencil and paper

When a [[solving technique]] is said to be suitable for '''pencil and paper''' (P&P) solvers, the technique can be performed without the use of computer programs. In theory, every technique could be P&P, but for practical purposes, we should only include techniques that use no more than the [[pencilmark]] grid and the margins. Certainly no extra sheets of paper.

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''(add a list of P&P techniques)''