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Draw a non-overlapping wordmatch dotplot of two sequences

dotpath generates a dotplot from two input sequences. The dotplot is an intuitive graphical representation of the regions of similarity between two sequences. Sequence "words" of a user-specified length are compared and all exact word matches between the two sequences are recorded. The set of the longest possible but non-overlapping matches is identified. The two sequences are the axes of the rectangular dotplot. Wherever there is an exact matching word in the two sequences a line is plotted.