question: the returned iterator does not support remove . concode_field_sep BiMap<T,Integer> indices concode_elem_sep long serialVersionUID concode_field_sep int highestIndex concode_elem_sep T lookup concode_elem_sep boolean contains concode_elem_sep Map<Integer,T> mapping concode_elem_sep int size concode_elem_sep int find concode_elem_sep void clear concode_elem_sep int index concode_elem_sep String toString concode_elem_sep boolean indexAll concode_elem_sep Set<T> items
target: Iterator < Map . Entry < T , Integer >> function ( ) { return Collections . unmodifiableSet ( indices . entrySet ( ) ) . iterator ( ) ; }