1for (i = 0; i < 3; ++i) if (2 < 3) 1 2if (3 < 4) for (i = 0; i < 3; ++i) if (4 < 5) 2 3for (j = 0; j < 3; ++j) if (5 < 6) for (i = 0; i < 3; ++i) if (4 < 5) 3 4if (6 < 7) for (j = 0; j < 3; ++j) if (5 < 6) for (i = 0; i < 3; ++i) if (4 < 5) 4 5