Paper bag side gussets and zip: what they have in common

1. Step 1. Paper bag side gussets — is part of — Paper bag. They let the bag fold flat.
2. Step 2. Paper bag — is made of — Paper. Paper.
3. Step 3. Paper — is material for — Paper money. Paper.
4. Step 4. Paper money — is used in — Wallet. It holds money.
5. Step 5. Wallet — has part — Zip. A zipped coin compartment.

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