Mechanical clock and electronic calculator: what they have in common

1. Step 1. Mechanical clock — includes — Tower clock. A clock.
2. Step 2. Tower clock — is part of — Gothic cathedral. A tower clock.
3. Step 3. Gothic cathedral — has part — Window glass. Stained glass.
4. Step 4. Window glass — is part of — Solar panel. Tempered cover glass.
5. Step 5. Solar panel — is part of — Electronic calculator. Many run on a solar cell.

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