Coin obverse and reverse faces and computer: what they have in common

1. Step 1. Coin obverse and reverse faces — is part of — Coin. Front and back with pictures.
2. Step 2. Coin — is made of — Silver. Silver coins.
3. Step 3. Silver — is material for — Electroencephalograph. The electrodes are silver with silver chloride.
4. Step 4. Electroencephalograph — is used in — Brain–computer interface. Brain signals.
5. Step 5. Brain–computer interface — has part — Computer. Decoding instructions.

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