question: private static Set < String > jaccardSet ( String strA ) { Set < String > set = new HashSet < > ( ) ; for ( int i = 0 , sz = strA . length ( ) ; i < sz ; i += 2 ) { int end = Math . min ( i + 2 , sz ) ; String s = strA . substring ( i , end ) ; set . add ( s ) ; } return set ; }
target:  Convert a string to a set.