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new encoder, allows non monotonically increasing sequence matches for moar compression.

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#! /usr/bin/env python
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import sys
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from bzrlib.branch import Branch
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b = Branch.open('.')
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rev_id = sys.argv[1]
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rh = []
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while True:
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    rh.append(rev_id)
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    rev = b.get_revision(rev_id)
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    if rev.parent_ids:
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        rev_id = rev.parent_ids[0]
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    else:
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        break
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rh.reverse()
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for rev_id in rh:
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    print rev_id