first_t
for (t = first_t; t <= last_t; t++) {
for (t = first_t; t <= last_t; t++) {
for (t = first_t; t <= last_t; t++) {
for (t = first_t; t <= last_t; t++) {
for (d_t = first_t; d_t <= last_t; d_t++) {
for (s_t = first_t; s_t <= last_t; s_t++) {
for (d_t = first_t; d_t <= last_t; d_t++) {
for (tt = first_t; tt <= last_t; tt++)