Vault and internal combustion engine: what they have in common

1. Step 1. Vault — evolved into — Dome. A vault of revolution.
2. Step 2. Dome — is part of — Wood-fired oven. A vaulted chamber.
3. Step 3. Wood-fired oven — uses — Combustion. Burning wood provides the heat.
4. Step 4. Combustion — is used in — Internal combustion engine. Fuel burns in the cylinder.

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