Asphalt and railway track: what they have in common

1. Step 1. Asphalt — is material for — Motorway. Or asphalt.
2. Step 2. Motorway — has part — Interchange. Interchanges.
3. Step 3. Interchange — has part — Bridge. Flyovers.
4. Step 4. Bridge — includes — Truss bridge. A bridge.
5. Step 5. Truss bridge — uses — Railway track. Railway bridges.

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