The long ī is substituted for the a of ac (añc ) after the word ut when the aṅga (stem) is bha,
As उदीचः, उदीचा, उदीचे ॥,
Adhyāya 6 · Pāda 4 · Rule 139
The long ī is substituted for the a of ac (añc ) after the word ut when the aṅga (stem) is bha,
As उदीचः, उदीचा, उदीचे ॥,