Firework stars and personal computer: what they have in common

1. Step 1. Firework stars — is part of — Fireworks. Pellets with metal salts that give the colour.
2. Step 2. Fireworks — is made of — Paper. The body of a firework is a paper tube.
3. Step 3. Paper — is material for — Billboard. The poster is paper.
4. Step 4. Billboard — has part — LED. LED screens.
5. Step 5. LED — is part of — Computer mouse. An optical mouse.
6. Step 6. Computer mouse — is part of — Personal computer. A mouse.

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