Electronic scales and glasses: what they have in common

1. Step 1. Electronic scales — has part — Liquid-crystal display. The reading is on an LCD.
2. Step 2. Liquid-crystal display — has part — Polarizing filter. Polarizers.
3. Step 3. Polarizing filter — is part of — Sunglasses. Polarized glasses.
4. Step 4. Sunglasses — evolved from — Glasses. Glasses with dark lenses.

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