{HEAD ~ Substantial improvements} in the control of {TAIL ~ pollutants} from internal combustion engines may be obtained by pre drying a catalyst/hydrocarbon trap system and preferably incorporating a water trap in a catalyst/hydrocarbon trap system 
{ HEAD ~ Substantial improvements } in the control of { TAIL ~ pollutants } from internal combustion engines may be obtained by pre drying a catalyst / hydrocarbon trap system and preferably incorporating a water trap in a catalyst / hydrocarbon trap system
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