Perforated tear line and tank: what they have in common

1. Step 1. Perforated tear line — is part of — Toilet paper. Perforation lines.
2. Step 2. Toilet paper — is used in — Flush toilet. Hygiene.
3. Step 3. Flush toilet — is made of — Porcelain. Toilet bowls are earthenware and porcelain.
4. Step 4. Porcelain — is material for — Composite armour. Ceramic layers.
5. Step 5. Composite armour — is part of — Tank. Multi-layer armour.

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