nextent
for (e2 = p2; e2 != NULL; e2 = nextent(e2, 0)) {
for (e = p; e != NULL; e = nextent(e, mono)) {
struct info *nextent(struct info *, int);
for (e = p; e != NULL; e = nextent(e, mono)) {
for (e = i; e != NULL; e = nextent(e, 0)) {
for (e = i; e != NULL; e = nextent(e, 0)) {