english: Hence, at each step the set A is transformed into the set ( A ∪ { ( u , v ) } ) ∖ { ( u ′ , v ′ ) } .
non_english: Cé gurbh iad Avondale rogha na coitianta tháinig buachaillí GCM le plean agus chuireadar I bhfeidhm é.