extern void printInt(int val);
extern void printNewlines(int num);
extern void printSpaces(int num);

bool even(int i) {
    bool result = true;

    if (i > 0) result = odd(i - 1);
    else if (i < 0) result = odd(i + 1);

    return result;
}

bool odd(int i) {
    bool result = false;

    if (i > 0) result = even(i - 1);
    else if (i < 0) result = even(i + 1);

    return result;
}

export int main() {
    for (int i = 0, 6) {
        printInt((int) even(i));
        printSpaces(1);
    }
    printNewlines(1);

    for (int i = 0, 6) {
        printInt((int) odd(i));
        printSpaces(1);
    }
    printNewlines(1);

    printInt((int) even(37));
    printSpaces(1);
    printInt((int) odd(37));
    printNewlines(1);

    printInt((int) even(42));
    printSpaces(1);
    printInt((int) odd(42));
    printNewlines(1);

    return 0;
}