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extern const char *diff_unique_abbrev(const unsigned char *, int);
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extern int run_diff_files(struct rev_info *revs, int silent_on_removed);
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int argc, const char ** argv, int nongit, const char *prefix);
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extern int run_diff_index(struct rev_info *revs, int cached);
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extern int diff_flush_patch_id(struct diff_options *, unsigned char *);