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==Definitions and characterization==
[[File:Poset et graphe de comparabilité.svg|thumb|300px|Hasse diagram of a poset (left) and its comparability graph (right)]]
[[Image:Forbidden interval subgraph.svg|thumb|One of the forbidden induced subgraphs of a comparability graph. The generalized cycle
''a''–''b''–''d''–''f''–''d''–''c''–''e''–''c''–''b''–''a'' in this graph has odd length (nine) but has no triangular chords.]]
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