public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  String a = sc . nextLine ( ) ;
  int t = Integer . parseInt ( a ) ;
  while ( t > 0 ) {
    String b = sc . nextLine ( ) ;
    int n = Integer . parseInt ( b ) ;
    String s = sc . nextLine ( ) ;
    int c = 0 ;
    for ( int i = 0 ;
    i < s . length ( ) / 2 ;
    i ++ ) {
      if ( ( Math . abs ( s . charAt ( i ) - s . charAt ( s . length ( ) - 1 - i ) ) != 0 ) && ( Math . abs ( s . charAt ( i ) - s . charAt ( s . length ( ) - 1 - i ) ) != 2 ) ) {
        c = 1 ;
        break ;
      }
    }
    if ( c == 1 ) {
      System . out . println ( "NO" ) ;
    }
    else {
      System . out . println ( "YES" ) ;
    }
    t -- ;
  }
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; String a = sc . nextLine ( ) ; int t = Integer . parseInt ( a ) ; while ( t > 0 ) { String b = sc . nextLine ( ) ; int n = Integer . parseInt ( b ) ; String s = sc . nextLine ( ) ; int c = 0 ; for ( int i = 0 ; i < s . length ( ) / 2 ; i ++ ) { if ( ( Math . abs ( s . charAt ( i ) - s . charAt ( s . length ( ) - 1 - i ) ) != 0 ) && ( Math . abs ( s . charAt ( i ) - s . charAt ( s . length ( ) - 1 - i ) ) != 2 ) ) { c = 1 ; break ; } } if ( c == 1 ) { System . out . println ( " NO " ) ; } else { System . out . println ( " YES " ) ; } t -- ; } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))) (while_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal))) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal)) right: (identifier))))))) right: (decimal_integer_literal))) right: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal)) right: (identifier))))))) right: (decimal_integer_literal))))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (decimal_integer_literal))) (break_statement))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal))))) alternative: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))))) (expression_statement (update_expression (identifier)))))))