public static List < List < Integer >> factComb ( int n ) {
  List < List < Integer >> result_list = new ArrayList < List < Integer >> ( ) ;
  List < Integer > list = new ArrayList < Integer > ( ) ;
  factorsListFunc ( 2 , 1 , n , result_list , list ) ;
  return result_list ;
}

public static List < List < Integer > > factComb ( int n ) { List < List < Integer > > result_list = new ArrayList < List < Integer > > ( ) ; List < Integer > list = new ArrayList < Integer > ( ) ; factorsListFunc ( 2 , 1 , n , result_list , list ) ; return result_list ; }
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