For example, there are packages and their dependencies:
a -> b (a require b) b -> c & d x -> a y -> x z -> x z -> x & y
z, there are two dependency paths:
z -> x -> a -> b -> c z -> y -> x -> a -> b -> c
The question is how to find out the dependency paths between two specific Debian packages?
P.S. The idea behind is to draw the dependency graph for a given set of packages, include the intermediate ones missing in the chain.