Vault and aeroplane: what they have in common

1. Step 1. Vault — is made of — Brick. And of brick.
2. Step 2. Brick — is material for — Metro. The vaults of the first tunnels are brick.
3. Step 3. Metro — uses — Railway track. It runs on rails.
4. Step 4. Railway track — is used in — Wright Flyer. The Flyer had no wheels: it took off along a wooden rail.
5. Step 5. Wright Flyer — is a kind of — Aeroplane. The first aeroplane.

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