dependencies.lp
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	node(a; b; c; d).
	depends(b,a).
	depends(c,a).
	depends(d, a).
	depends(d, c).

	level(X, 0) :- not depends(X, _); node(X).

	level(X, LEVEL):- LEVEL = #max{L+1, level(Y, L): level(Y, L), depends(X, Y)}; node(X); LEVEL > 0.