Wok and vacuum pump: what they have in common

1. Step 1. Wok — is made of — Cast iron. Woks are cast iron.
2. Step 2. Cast iron — is material for — Jack. A jack is cast iron.
3. Step 3. Jack — has part — Check valve. Check valves.
4. Step 4. Check valve — is part of — Vacuum pump. Valves stop air from flowing back.

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