question: private Automaton insertionsOf ( String s ) { List < Automaton > list = new ArrayList < > ( ) ; for ( int i = 0 ; i <= s . length ( ) ; i ++ ) { Automaton a = Automata . makeString ( s . substring ( 0 , i ) ) ; a = Operations . concatenate ( a , Automata . makeAnyChar ( ) ) ; a = Operations . concatenate ( a , Automata . makeString ( s . substring ( i ) ) ) ; list . add ( a ) ; } Automaton a = Operations . union ( list ) ; a = MinimizationOperations . minimize ( a , DEFAULT_MAX_DETERMINIZED_STATES ) ; return a ; }
target:  Return an automaton that accepts all 1-character insertions of s (inserting one character)