Gram staining and electric fan: what they have in common

1. Step 1. Gram staining — uses — Synthetic dye. Aniline dyes.
2. Step 2. Synthetic dye — is made of — Coal. Aniline from coal tar.
3. Step 3. Coal — uses — Coal mine. Extraction.
4. Step 4. Coal mine — uses — Mine ventilation. Airing the workings.
5. Step 5. Mine ventilation — has part — Electric fan. Fans.

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