v1.0.0
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Handle surface IDs >= 1000 as implicitly defined, if not given in the input file.
Surface IDs >= 1000 have a special meaning in MCNP. They are interpreted as (surf_id + 1000*cell_id), where cell_id refers to a cell card and surf_id refers to another surface card. For example, surface ID 123456 refers to cell 123 and surface 456. The meaning of this syntax is that surface 123456 is obtained by applying the transformation defined in the TRCL card of cell 123 to surface 456.
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Print the real MCNP cell number in the T4 comments whenever possible.