INPUT NMIN,NMAX:
 n, Gray(n), Gray(Gray(n)), Gray(n).xor.Gray(n+1)
            0           0           0           1
          343         508         343           8
          686        1017         686           1
         1029        1543        1029           2
         1372        2034        1372           1
         1715        1514        1715           4
         2058        3087        2058           1
         2401        3537        2401           2
         2744        4068        2744           1
         3087        2568        3087          16
         3430        3029        3430           1
         3773        2531        3773           2
 INPUT NMIN,NMAX:
 n, Gray(n), Gray(Gray(n)), Gray(n).xor.Gray(n+1)
   2147483645  1073741827  2147483645           2
   2147483646  1073741825  2147483646           1
 INPUT NMIN,NMAX:
 NORMAL COMPLETION