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A MOD file example (a) and the corresponding sequences of the source and the destination (b). There are two SNPs between these sequences, and they are represented as two s-instructions at source positions 2 and 19. A three-base deletion (from source positions 8–10) is observed, and it is broken up into three d-instructions. The insertion after position 17 is directly added to the MOD file without any conversion because of its atomicity.
