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25. Island Lump and Island Nuts, manufactured by Unocal Refinery, California, the United States of America, which—
(a)comprise petroleum coke;
(b)were manufactured from the petroleum coke by a process involving heat treatment and steam injection;
(c)are unmarked random shapes;
(d)have an average weight of 80 grams (per briquette of Island Lump) or 30 grams (per briquette of Island Nuts); and
(e)have a sulphur content not exceeding 2% of the total weight.