Rifle magazine and sonar: what they have in common

1. Step 1. Rifle magazine — is part of — Mosin rifle. Five cartridges.
2. Step 2. Mosin rifle — has part — Gun barrel. A rifled barrel.
3. Step 3. Gun barrel — is part of — Anti-aircraft gun. A long barrel.
4. Step 4. Anti-aircraft gun — uses — Radar. Radar guidance.
5. Step 5. Radar — works like — Sonar. The same echolocation principle: sound in water instead of radio waves.

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