#include <S.h>

void CxExchange();

void
MyFlip(x, y, z, w)
complex *x, *y, *z, *w;
{

	CxExchange(x, y);
	CxExchange(z, w);
	CxExchange(x, w);
	CxExchange(y, z);
	CxExchange(x, y);
	CxExchange(z, w);	/* should now be in reverse order */
}