Shower and watt steam engine: what they have in common

1. Step 1. Shower — uses — Plumbing. Plumbing.
2. Step 2. Plumbing — is used in — Fire hydrant. Plumbing.
3. Step 3. Fire hydrant — has part — Valve. A gate valve.
4. Step 4. Valve — is part of — Watt steam engine. A slide valve distributes the steam.

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