What if you had a related table with your key, state and relation columns.
In the relations column you would have 4 chars, the first two are the state,
the next two are the bordering state.  Tennessee would have something like
the following:

Key State       relation
1       TN      TNAR
1       TN      TNMS
1       TN      TNMO
1       TN      TNKY
1       TN      TNNC
1       TN      TNVA
1       TN      TNAL
1       TN      TNGA

I was thinking of something like:

State   Neighbor
NE     SD
NE     IA
NE     MO
NE     KS
NE     CO
NE     WY
SD     ND
SD     MN
SD     IA
SD     NE
SD     WY
SD     MT

The problem is that I would need to group together states that don't
border eachother, but in which it is between two other states.  For
example, the table above, you can deduce that NE and ND can be grouped
together in the same chain if SD if also present.

I think that will make it weird is when you have a situation in wihch
three or more states border eachother, like NE, IA, and SD.



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