question: private static Collection < Collection < DsnNetPin > > create_ordered_subnets ( Collection < DsnNetPin > p_pin_list ) { Collection < Collection < DsnNetPin > > result = new LinkedList < Collection < DsnNetPin > > ( ) ; if ( p_pin_list . isEmpty ( ) ) { return result ; } Iterator < DsnNetPin > it = p_pin_list . iterator ( ) ; DsnNetPin prev_pin = it . next ( ) ; while ( it . hasNext ( ) ) { DsnNetPin next_pin = it . next ( ) ; Set < DsnNetPin > curr_subnet_pin_list = new java . util . TreeSet < DsnNetPin > ( ) ; curr_subnet_pin_list . add ( prev_pin ) ; curr_subnet_pin_list . add ( next_pin ) ; result . add ( curr_subnet_pin_list ) ; prev_pin = next_pin ; } return result ; }
target:  Creates a sequence of subnets with 2 pins from p_pin_list