static double calcEuclidDistance ( double x1 , double y1 , double x2 , double y2 ) {
  double d = Math . sqrt ( ( x2 - x1 ) * ( x2 - x1 ) + ( y2 - y1 ) * ( y2 - y1 ) ) ;
  return d ;
}

static double calcEuclidDistance ( double x1 , double y1 , double x2 , double y2 ) { double d = Math . sqrt ( ( x2 - x1 ) * ( x2 - x1 ) + ( y2 - y1 ) * ( y2 - y1 ) ) ; return d ; }
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