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tree2 = wt.bzrdir.sprout('tree2').open_workingtree()
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tree3 = wt.bzrdir.sprout('tree3').open_workingtree()
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tree3.commit('commit three a', rev_id='3a')
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tree2.commit('commit three b', rev_id='3b')
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wt.commit('commit three c', rev_id='3c')
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tree2.commit('four-a', rev_id='4a')
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wt.commit('four-b', rev_id='4b')
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mainline_revs = [None, '1', '2', '3c', '4b']
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rev_nos = {'1': 1, '2': 2, '3c': 3, '4b': 4}