Comb spine and tank: what they have in common

1. Step 1. Comb spine — is part of — Comb. The base that holds the teeth.
2. Step 2. Comb — is made of — Bone. Ancient combs were carved from bone and antler.
3. Step 3. Bone — is material for — Dentures. With teeth made of bone or real teeth.
4. Step 4. Dentures — is made of — Porcelain. Porcelain teeth.
5. Step 5. Porcelain — is material for — Composite armour. Ceramic layers.
6. Step 6. Composite armour — is part of — Tank. Multi-layer armour.

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