Chlorine and vacuum pump: what they have in common

1. Step 1. Chlorine — is material for — Polyvinyl chloride (PVC). It contains chlorine.
2. Step 2. Polyvinyl chloride (PVC) — is material for — Cling film. Cling film was made of PVC; now it is more often polyethylene.
3. Step 3. Cling film — is used in — Vacuum sealer. Film.
4. Step 4. Vacuum sealer — has part — Vacuum pump. A pump.

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