public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int t , x , y , u , d , r , l ;
  String s = "" ;
  x = y = u = d = r = l = 0 ;
  t = sc . nextInt ( ) ;
  while ( t -- > 0 ) {
    x = sc . nextInt ( ) ;
    y = sc . nextInt ( ) ;
    s = sc . next ( ) ;
    for ( int i = 0 ;
    i < s . length ( ) ;
    i ++ ) {
      if ( s . charAt ( i ) == 'U' ) u ++ ;
      else if ( s . charAt ( i ) == 'D' ) d -- ;
      else if ( s . charAt ( i ) == 'R' ) r ++ ;
      else l -- ;
    }
    if ( ( y >= d && y <= u ) && ( x >= l && x <= r ) ) System . out . println ( "YES" ) ;
    else System . out . println ( "NO" ) ;
    l = d = r = u = 0 ;
  }
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int t , x , y , u , d , r , l ; String s = " " ; x = y = u = d = r = l = 0 ; t = sc . nextInt ( ) ; while ( t -- > 0 ) { x = sc . nextInt ( ) ; y = sc . nextInt ( ) ; s = sc . next ( ) ; for ( int i = 0 ; i < s . length ( ) ; i ++ ) { if ( s . charAt ( i ) == ' U ' ) u ++ ; else if ( s . charAt ( i ) == ' D ' ) d -- ; else if ( s . charAt ( i ) == ' R ' ) r ++ ; else l -- ; } if ( ( y >= d && y <= u ) && ( x >= l && x <= r ) ) System . out . println ( " YES " ) ; else System . out . println ( " NO " ) ; l = d = r = u = 0 ; } }
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