I thought it would be interesting to make a version which spits out
the paths:
http://github.com/timothypratley/strive/blob/master/clj/sandpit/fw.clj

shortest-path 7 2:
({:node 7, :step-cost 0, :remaining-cost 6}
 {:node 8, :step-cost 1, :remaining-cost 5}
 {:node 6, :step-cost 1, :remaining-cost 4}
 {:node 3, :step-cost 1, :remaining-cost 3}
 {:node 0, :step-cost 1, :remaining-cost 2}
 {:node 1, :step-cost 1, :remaining-cost 1}
 {:node 2, :step-cost 1, :remaining-cost 0})

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