first 0 X nil first s X cons Y Z cons Y n__first X activate Z from X cons X n__from n__s X first X1 X2 n__first X1 X2 from X n__from X s X n__s X activate n__first X1 X2 first activate X1 activate X2 activate n__from X from activate X activate n__s X s activate X activate X X first 2 0 0 nil 0 s 1 cons 2 n__first 2 activate 1 from 1 n__from 1 n__s 1 FULL ./TRS/TRCSR/Ex6_Luc98_FR.trs