Electrolyser and modem: what they have in common

1. Step 1. Electrolyser — uses — Electrolysis. Electrolysis of water.
2. Step 2. Electrolysis — uses — Electrochemical reaction. An electrochemical process.
3. Step 3. Electrochemical reaction — is used in — Fax. The paper darkened under current.
4. Step 4. Fax — has part — Modem. It transmits an image over a telephone line.

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