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1) draw out steps on paper
2) write pseudo code
3) code it
for every zip code generate a tree that has a branch to any other zip code, and from that node to any remaining one etc.
1 2 3 4
1
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2 3 4
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3 4 2 4 2 3
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4 3 4 2 3 2
etc. you get my drift, i hope
good luck
Dizz
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