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| Tunnels | |
|---|---|
| Broader Terms | Transportation_facilities_(27) |
| Narrower Terms | Railroad_tunnels_(4) |
| Related Terms | Roads_(4), Subways_(3) |
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| Tunnels | |
|---|---|
| Broader Terms | Transportation_facilities_(27) |
| Narrower Terms | Railroad_tunnels_(4) |
| Related Terms | Roads_(4), Subways_(3) |