app lam %X a F %X Y F Y lam %Y a app U %Y U rec zero V %Z Nat I %Z V rec succ P X1 %U Nat Z1 %U Z1 P rec P X1 %V Nat Z1 %V F a b Y a U arrab V a I Nat a a P Nat X1 a Z1 Nat a a app arrab a b lam a b arrab rec Nat a Nat a a a succ Nat Nat zero Nat FULL tmptmptmp.afsm