public static void main ( String [ ] args ) {
  Scanner in = new Scanner ( System . in ) ;
  int T = in . nextInt ( ) ;
  for ( int t = 0 ;
  t < T ;
  t ++ ) {
    int N = in . nextInt ( ) ;
    int Q = in . nextInt ( ) ;
    char [ ] S = in . next ( ) . toCharArray ( ) ;
    for ( int q = 0 ;
    q < Q ;
    q ++ ) {
      int L = in . nextInt ( ) - 1 ;
      int R = in . nextInt ( ) - 1 ;
      boolean found = false ;
      for ( int i = 0 ;
      i < L ;
      i ++ ) {
        if ( S [ L ] == S [ i ] ) {
          found = true ;
        }
      }
      for ( int i = R + 1 ;
      i < N ;
      i ++ ) {
        if ( S [ R ] == S [ i ] ) {
          found = true ;
        }
      }
      System . out . println ( found ? "YES" : "NO" ) ;
    }
  }
}

public static void main ( String [ ] args ) { Scanner in = new Scanner ( System . in ) ; int T = in . nextInt ( ) ; for ( int t = 0 ; t < T ; t ++ ) { int N = in . nextInt ( ) ; int Q = in . nextInt ( ) ; char [ ] S = in . next ( ) . toCharArray ( ) ; for ( int q = 0 ; q < Q ; q ++ ) { int L = in . nextInt ( ) - 1 ; int R = in . nextInt ( ) - 1 ; boolean found = false ; for ( int i = 0 ; i < L ; i ++ ) { if ( S [ L ] == S [ i ] ) { found = true ; } } for ( int i = R + 1 ; i < N ; i ++ ) { if ( S [ R ] == S [ i ] ) { found = true ; } } System . out . println ( found ? " YES " : " NO " ) ; } } }
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