Gelatin capsule shell and rock drill: what they have in common

1. Step 1. Gelatin capsule shell — is part of — Capsule. It dissolves in the stomach.
2. Step 2. Capsule — is part of — Pneumatic tube. A container for letters.
3. Step 3. Pneumatic tube — uses — Compressed air. Air pressure.
4. Step 4. Compressed air — is used in — Rock drill. Pneumatics.

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