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15 for tok, val in list(seq):
16 if tok == IN:
17 negate = val[0] == (NEGATE, None)
18 19 cats = sorted(in_cat for in_type, in_cat in val if in_type == CATEGORY)
20 for i in range(0, len(CHCODES), 2):
21 if CHCODES[i] in cats and CHCODES[i+1] in cats:
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