question: public void pop ( ) { int size = level . size ( ) - 1 ; Object ob = level . remove ( size ) ; if ( ob != null ) { symb = ( SymbMap ) ob ; if ( size == 0 ) { cloned = false ; } else { cloned = ( level . get ( size - 1 ) != symb ) ; } } else { cloned = false ; } }
target:  Pop a frame. Inclusive or Exclusive.