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        PROGRAM TEST     
        INTEGER rmax,cmax,xmax,ymax
        REAL x(160000),y(160000),r(25600000000)

        rmax=400
        cmax=400
        xmax=rmax*cmax
        ymax=xmax

        d=2

        DO j=1,rmax
                DO i=1,cmax
                x(n)=(i-1)*d
                y(n)=(j-1)*d
                n=n+1
                ENDDO
        ENDDO

        DO i=1,ymax
                DO j=1,xmax
                        IF (i.NE.j)THEN
                        r(l)=SQRT((y(j)-y(i))**2+(x(j)-x(i))**2)
                        l=l+1
                        ENDIF
                ENDDO
        ENDDO
       
      END
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