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inv.root.revision = b'root-rev'
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inv.add(inventory.TreeReference(b'nested-id', 'nested', b'tree-root-321',
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b'rev-outer', b'rev-inner'))
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s_v5.write_inventory_to_lines, inv)
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s_v6.write_inventory_to_lines, inv)
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lines = s_v7.write_inventory_to_chunks(inv)
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inv2 = s_v7.read_inventory_from_lines(lines)