R_NOTHING
if (rooms[i+1].is_room & R_NOTHING) {
if (rooms[i+3].is_room & R_NOTHING) {
rooms[i].is_room = R_NOTHING;
if (rooms[j].is_room & R_NOTHING) {
if ((rooms[rn].is_room & R_NOTHING) ||
if (!(rooms[de].is_room & R_NOTHING)) {