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This means the pattern that matches the most characters in the input. All characters in valid input are matched by some pattern. The original file name input is broken into a sequence of strings. Matching of an individual decision tree node ends with the end of an individual string. The remaining strings are then matched against the remaining pattern components. Input: data File name portion to match against this decision tree branch. more Sequence of additional pieces of the file name. Returns: (unmatched, patlocs, report_items) unmatched That portion of the data which did not match, or True when all the data matched but no convention was exhausted. The empty string ('') when the data matches one or more patterns. patlocs Iterable (really, a set) of the PatternLoc instances which match "the most". report_items List of "things" (at the moment unusual parentheticals) to be reported when the data matches, or the empty list when the data does not exhaustively match any pattern. 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