Postal service and chisel: what they have in common

1. Step 1. Postal service — uses — Steam locomotive. Mail trains.
2. Step 2. Steam locomotive — uses — Railway track. It runs on rails.
3. Step 3. Railway track — is used in — Metro. It runs on rails.
4. Step 4. Metro — uses — Tunnel. Tunnels.
5. Step 5. Tunnel — uses — Chisel. Hezekiah’s Tunnel was cut by hand with chisels.

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