public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int t = sc . nextInt ( ) ;
  while ( t -- > 0 ) {
    int n = sc . nextInt ( ) ;
    int k = sc . nextInt ( ) ;
    String s = sc . next ( ) ;
    char ch = ' ' ;
    char ch2 = ' ' ;
    int sum = 0 ;
    int min = 0 , max = n - 1 ;
    while ( ( max - min ) >= 2 ) {
      ch = s . charAt ( min ) ;
      ch2 = s . charAt ( max ) ;
      if ( ch == ch2 ) sum ++ ;
      else break ;
      max -- ;
      min ++ ;
    }
    if ( sum >= k ) System . out . println ( "YES" ) ;
    else System . out . println ( "NO" ) ;
  }
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int t = sc . nextInt ( ) ; while ( t -- > 0 ) { int n = sc . nextInt ( ) ; int k = sc . nextInt ( ) ; String s = sc . next ( ) ; char ch = ' ▁ ' ; char ch2 = ' ▁ ' ; int sum = 0 ; int min = 0 , max = n - 1 ; while ( ( max - min ) >= 2 ) { ch = s . charAt ( min ) ; ch2 = s . charAt ( max ) ; if ( ch == ch2 ) sum ++ ; else break ; max -- ; min ++ ; } if ( sum >= k ) System . out . println ( " YES " ) ; else System . out . println ( " NO " ) ; } }
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