public static long pmod ( long x , long y ) {
  long r = 1 ;
  while ( y > 0 ) {
    if ( y % 2 == 1 ) {
      r = ( r * x ) % mod ;
    }
    x = ( x * x ) % mod ;
    y >>= 1 ;
  }
  return r ;
}

public static long pmod ( long x , long y ) { long r = 1 ; while ( y > 0 ) { if ( y % 2 == 1 ) { r = ( r * x ) % mod ; } x = ( x * x ) % mod ; y >>= 1 ; } return r ; }
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