[GENERAL] table of US states' neighbours

[brian]

I'd like to add a table, state_neighbours, which joins each state with 
all of its neighbour states. Does anyone know where I can find such a list?

I'm not interested in "nearest neighbour", just any connected state.
eg. IA would be associated with {MN,WS,IL,MO,KS,NB,SD} and HI & AK would 
not be represented.

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