Depth-first searches are easy to code by simple recursion.

Breadth-first searches are good for finding short solutions and not getting 
caught in infinite recursions.

Are there any ready-made tools in Racket for turning depth-first search 
code into breadth-first by strategic use of continuations?

That is, at strategic points in the depth-first search you spawn 
continuation instead of going deeper and save that continuation into a 
stable somewhere so as to ride it again later?

-- hendrik

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