[r2003-11-26 16:22:19 by szach] added first related functions: first_of_particle,
first_of_model_group, is_in_first, nullable Original author: szach Date: 2003-11-26 16:22:19+00:00
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first_of_model_group, is_in_first, nullable Original author: szach Date: 2003-11-26 16:22:19+00:00