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Given a set of directed paths (called lines) L, a public transportation network is a directed graph GL = (VL, AL) which contains exactly the vertices and arcs of every line l ∈ L. An st-route is a pair (π, γ) where γ = 〈l1,…, lh〉 is a line sequence and π is an st-path in GL which is the concatenation of subpaths of the lines l1,…, lh, in this order. Given a threshold β, we present an algorithm for...
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