A10.itrs

contents

(VAR x y u v)
(RULES
f(TRUE, x, y) -> fNat(x >= 0 && y >= 0, x, y)
fNat(TRUE, x, y) -> f(x > y, trunc(x), y+1)
trunc(x) -> if(x % 2 = 0, x, x-1)
if(TRUE, u, v) -> u
if(FALSE, u, v) -> v
)

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