8-16-90  Correct chain 6 (counting from 0) of jul - polygons were swapped.

twosq:
    1001   (2,1) 
11111322222	
1    3    2	
1 1  3 2  2	
1    3    2	
1    3    2	
11111222222	
(0,0)      (2,0)
    1002

Chain 3 has a jog to the right in the middle.

us.22a and us.28a contain the chains for those states with the
neighboring states still mentioned in the chain.

us.22 and us.28 have the neighboring states zeroed.


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11-24-91

Edit data file us, to delete 2 2-point opposite chains on polygon 37,
480041 and 410048.  Put the new file in us2.
