History Note English:
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75; used with Category A & B 1975; A, B & C4 1976-77; A1-11, A13-16, B & C4 1978-86; A1-11, A13-16, B, C4, CALCULI+, DNA+ & RNA+ 1987-88; A1-11, A13-16, B1, B3-6, C4, CALCULI+, NUCLEIC ACIDS+ & PROTEINS+ 1989; A2-11, A13-16, B1, B3-6 & C4 1990 forward
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