A one-page article from Master Weaver that explains how to calculate the number of symmetrical pattern variations for a given number of blocks, using three permutation formulas. The formulas cover blocks woven singly with no ground, blocks combined at will, and blocks with ground that cannot be combined, each worked through for four blocks. It then lists which weave structures each formula suits, such as overshot, Bronson, summer and winter, and double weaves.