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        sequences = {}
        markchar = '#'
        heure = re.compile( '(\\d+)\\D*$')
        heure2 = re.compile( '(.*)\\.\\%s+(\\.\\D*)$' % markchar)

        lsrc = len(self._shotFolder) + 1

        for root, dirs, files in os.walk(self._shotFolder, topdown = True):
            relroot = root[lsrc:]

            for fn in files:


                # heuristic: for each file, get the last contiguous numeric seq
                # of characters within the file, and the rest of the filename
                # becomes the key for the sequence.
                
                    mo = heure.search(fn)
                    if mo:
                       key = fn[:mo.start(1)] + \
                       markchar * len(mo.group(1)) + \
                       fn[mo.end(1):]

                    else:
                       key = fn

                    key = join(relroot, key)