Perforated tear line and aerosol can: 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 — has part — Valve. The cistern’s float valve.
4. Step 4. Valve — is part of — Aerosol can. A valve.

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