typedef a = ();
typedef b = (int x);
typedef c = (
    int x,
);
typedef d = (int x, int y);
typedef e = (
    int x,
    int y,
);

typedef f = (int, int);
typedef g = (
    int,
    int,
);
typedef h = (int x, int);
typedef i = (int, int y);

typedef j = (a x, k y);
typedef k = (() x, () y);
typedef l = (int x, () y, (int xx, int, (int q, (),)) z);