question: public static void expandDigits ( String numberString , WordRelation wordRelation ) { int numberDigits = numberString . length ( ) ; for ( int i = 0 ; i < numberDigits ; i ++ ) { char digit = numberString . charAt ( i ) ; if ( isDigit ( digit ) ) { wordRelation . addWord ( digit2num [ numberString . charAt ( i ) - '0' ] ) ; } else { wordRelation . addWord ( "umpty" ) ; } } }
target:  Expands given token to list of words pronouncing it as digits