Medicinal powder and turbojet engine: what they have in common

1. Step 1. Medicinal powder — is part of — Capsule. A powder or liquid inside.
2. Step 2. Capsule — is part of — Pneumatic tube. A container for letters.
3. Step 3. Pneumatic tube — has part — Compressor. A pressure or vacuum blower.
4. Step 4. Compressor — is part of — Turbojet engine. The compressor compresses the air.

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