(VAR X XS N Y YS X1 X2)
(RULES 
active(from(X)) -> mark(cons(X,from(s(X))))
active(sel(0,cons(X,XS))) -> mark(X)
active(sel(s(N),cons(X,XS))) -> mark(sel(N,XS))
active(minus(X,0)) -> mark(0)
active(minus(s(X),s(Y))) -> mark(minus(X,Y))
active(quot(0,s(Y))) -> mark(0)
active(quot(s(X),s(Y))) -> mark(s(quot(minus(X,Y),s(Y))))
active(zWquot(XS,nil)) -> mark(nil)
active(zWquot(nil,XS)) -> mark(nil)
active(zWquot(cons(X,XS),cons(Y,YS))) -> mark(cons(quot(X,Y),zWquot(XS,YS)))
mark(from(X)) -> active(from(mark(X)))
mark(cons(X1,X2)) -> active(cons(mark(X1),X2))
mark(s(X)) -> active(s(mark(X)))
mark(sel(X1,X2)) -> active(sel(mark(X1),mark(X2)))
mark(0) -> active(0)
mark(minus(X1,X2)) -> active(minus(mark(X1),mark(X2)))
mark(quot(X1,X2)) -> active(quot(mark(X1),mark(X2)))
mark(zWquot(X1,X2)) -> active(zWquot(mark(X1),mark(X2)))
mark(nil) -> active(nil)
from(mark(X)) -> from(X)
from(active(X)) -> from(X)
cons(mark(X1),X2) -> cons(X1,X2)
cons(X1,mark(X2)) -> cons(X1,X2)
cons(active(X1),X2) -> cons(X1,X2)
cons(X1,active(X2)) -> cons(X1,X2)
s(mark(X)) -> s(X)
s(active(X)) -> s(X)
sel(mark(X1),X2) -> sel(X1,X2)
sel(X1,mark(X2)) -> sel(X1,X2)
sel(active(X1),X2) -> sel(X1,X2)
sel(X1,active(X2)) -> sel(X1,X2)
minus(mark(X1),X2) -> minus(X1,X2)
minus(X1,mark(X2)) -> minus(X1,X2)
minus(active(X1),X2) -> minus(X1,X2)
minus(X1,active(X2)) -> minus(X1,X2)
quot(mark(X1),X2) -> quot(X1,X2)
quot(X1,mark(X2)) -> quot(X1,X2)
quot(active(X1),X2) -> quot(X1,X2)
quot(X1,active(X2)) -> quot(X1,X2)
zWquot(mark(X1),X2) -> zWquot(X1,X2)
zWquot(X1,mark(X2)) -> zWquot(X1,X2)
zWquot(active(X1),X2) -> zWquot(X1,X2)
zWquot(X1,active(X2)) -> zWquot(X1,X2)
)