static void result ( String s , int n ) {
  HashSet < String > st = new HashSet < String > ( ) ;
  for ( int i = 0 ;
  i < ( int ) s . length ( ) ;
  i ++ ) {
    String ans = "" ;
    for ( int j = i ;
    j < ( int ) s . length ( ) ;
    j ++ ) {
      ans += s . charAt ( j ) ;
      if ( ans . length ( ) == n ) {
        st . add ( ans ) ;
        break ;
      }
    }
  }
  for ( String it : st ) System . out . print ( it + " " ) ;
}

static void result ( String s , int n ) { HashSet < String > st = new HashSet < String > ( ) ; for ( int i = 0 ; i < ( int ) s . length ( ) ; i ++ ) { String ans = " " ; for ( int j = i ; j < ( int ) s . length ( ) ; j ++ ) { ans += s . charAt ( j ) ; if ( ans . length ( ) == n ) { st . add ( ans ) ; break ; } } } for ( String it : st ) System . out . print ( it + " ▁ " ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (generic_type (type_identifier) (type_arguments (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments (type_identifier))) arguments: (argument_list)))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (cast_expression type: (integral_type) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) update: (update_expression (identifier)) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (string_literal))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (identifier))) condition: (binary_expression left: (identifier) right: (cast_expression type: (integral_type) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))) (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (identifier))) consequence: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) (break_statement))))))) (enhanced_for_statement type: (type_identifier) name: (identifier) value: (identifier) body: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (string_literal))))))))