Wok and sonar: 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 — Landmine. The casing is cast iron.
3. Step 3. Landmine — is used in — Minesweeper. Against sea mines.
4. Step 4. Minesweeper — has part — Sonar. Searching for mines.

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