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Def map2(f;l1;l2)
Def == if null(l1)
Def == then nil
Def == else if null(l2)
Def == else then nil
Def == else else cons((f(head(l1),head(l2))); map2(f;tl(l1);tl(l2)))
Def == else fi
Def == fi
Def (recursive)