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4. No person may sell by retail any margarine unless it contains in every 100 grams —
(a)not less than 800 micrograms and not more than 1,000 micrograms of vitamin A, and
(b)not less than 7.05 micrograms and not more than 8.82 micrograms of vitamin D,
and a proportionate amount in any part of 100 grams.