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Sub-topic:
02 - Infra-red spectroscopy
9701_22
9701_w19_qp_22_04
9701_w20_qp_21_03
9701_w20_qp_22_04
9701_w21_qp_21_04
9701_w18_qp_21_04
9701_w18_qp_22_03
9701_s21_qp_22_05
9701_s20_qp_21_06
9701_s16_qp_22_04
9701_s16_qp_23_04
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