code    ChOut=8, CrLf=9, IntOut=11;

ffunc M; \forward-referenced function declaration

func F(N);
int N;
return if N=0 then 1 else N - M(F(N-1));

func M(N);
int N;
return if N=0 then 0 else N - F(M(N-1));

int I;
[for I:= 0 to 19 do [IntOut(0, F(I));  ChOut(0, ^ )];
CrLf(0);
 for I:= 0 to 19 do [IntOut(0, M(I));  ChOut(0, ^ )];
CrLf(0);
]