/home/nowonder/forschung/aprove/TPDB05/TRS/TRCSR/Ex2_Luc03b_L.trs

The program

(VAR Z Y X)
(RULES 
fst(0,Z) -> nil
fst(s,cons(Y)) -> cons(Y)
from(X) -> cons(X)
add(0,X) -> X
add(s,Y) -> s
len(nil) -> 0
len(cons(X)) -> s
)

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