Def <<"a", b>, c, 1> => body(b;c) cont(x,z)
Def == x/x2,x1.
Def == x2/x2@0,x1@0.
Def == InjCase(if x2@0="a"Atominl(*); inr(*) fi
Def == InjCase; x1/x2@1,x1@1.
Def == InjCase; InjCase(if x1@1=1 inl(*) ; inr(*) fi
Def == InjCase; InjCase; body(x1@0;x2@1)
Def == InjCase; InjCase; cont(z,z))
Def == InjCase; cont(z,z))

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