Waistband and sonar: what they have in common

1. Step 1. Waistband — is part of — Trousers. The upper edge.
2. Step 2. Trousers — has part — Zip. A fastener.
3. Step 3. Zip — is part of — Bag. A zip.
4. Step 4. Bag — is made of — Leather. Leather.
5. Step 5. Leather — is material for — Submarine. It was covered with leather.
6. Step 6. Submarine — has part — Sonar. Underwater acoustics.

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