en drainage system (n, artifact)
― IsA ⟶
Weight: 2.0
en system (n, artifact) Source: Open Multilingual WordNet
en drainage system (n)
― IsA ⟶
Weight: 1.0
en physical path system (n) Source: OpenCyc 2012
en drainage system (n)
― IsA ⟶
Weight: 1.0
en tangible thing (n) Source: OpenCyc 2012