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20 points
ANTIKNOCKS is validvalid
ANTIKNOCK, a gasoline additive used to reduce engine knocking and increase the fuel's octane rating [n]
ANTIKNOCK, an additive in petrol, used to prevent knock [n]
ANTIKNOCK, a gasoline additive used to reduce engine knocking and increase the fuel's octane rating [n]
ANTIKNOCK, an additive in petrol, used to prevent knock [n]