Gummed adhesive back and rock drill: what they have in common

1. Step 1. Gummed adhesive back — is part of — Postage stamp. Gum on the back.
2. Step 2. Postage stamp — uses — Postal service. Paying for delivery.
3. Step 3. Postal service — includes — Pneumatic tube. The post.
4. Step 4. Pneumatic tube — uses — Compressed air. Air pressure.
5. Step 5. Compressed air — is used in — Rock drill. Pneumatics.

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