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#include <tcclib.h> int fib(n){    if (n <= 2)        return 1;    else        return fib(n-1) + fib(n-2);} int main(int argc, char **argv){    int n;    if (argc < 2) {        printf("usage: fib n\n"               "Compute nth Fibonacci number\n");        return 1;    }     n = atoi(argv[1]);    printf("fib(%d) = %d\n", n, fib(n, 2));    return 0;}