The result of comparison is an "edit script": a chain of change objects. Each change represents one place where some lines are deleted and some are inserted. LINE0 and LINE1 are the first affected lines in the two files (origin 0). DELETED is the number of lines deleted here from file 0. INSERTED is the number of lines inserted here in file 1. If DELETED is 0 then LINE0 is the number of the line before which the insertion was done; vice versa for INSERTED and LINE1.
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