Sunglasses and payment card: what they have in common

1. Step 1. Sunglasses — has part — Polarizing filter. Polarized glasses.
2. Step 2. Polarizing filter — is part of — Liquid-crystal display. Polarizers.
3. Step 3. Liquid-crystal display — is part of — Electronic calculator. An LCD display.
4. Step 4. Electronic calculator — has part — Integrated circuit. A chip.
5. Step 5. Integrated circuit — is part of — Payment card. An EMV chip.

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