Ratchet and data centre: what they have in common

1. Step 1. Ratchet — is part of — Turnstile. A ratchet.
2. Step 2. Turnstile — is part of — Metro. Turnstiles.
3. Step 3. Metro — is made of — Brick. The vaults of the first tunnels are brick.
4. Step 4. Brick — is material for — Power station. The buildings of the first power stations were brick.
5. Step 5. Power station — is part of — Electrical grid. Power stations feed the grid.
6. Step 6. Electrical grid — is used in — Data centre. Power.

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