from X cons X n__from s X sel 0 cons X XS X sel s N cons X XS sel N activate XS minus X 0 0 minus s X s Y minus X Y quot 0 s Y 0 quot s X s Y s quot minus X Y s Y zWquot XS nil nil zWquot nil XS nil zWquot cons X XS cons Y YS cons quot X Y n__zWquot activate XS activate YS from X n__from X zWquot X1 X2 n__zWquot X1 X2 activate n__from X from X activate n__zWquot X1 X2 zWquot X1 X2 activate X X from 1 cons 2 n__from 1 s 1 sel 2 0 0 activate 1 minus 2 quot 2 zWquot 2 nil 0 n__zWquot 2 FULL ./TRS/TRCSR/Ex4_7_37_Bor03_Z.trs