Perforated piano roll e rocket: o que têm em comum

1. Passo 1. Perforated piano roll — faz parte de — Player piano. Perforated paper with the tune recorded on it.
2. Passo 2. Player piano — é feito de — Paper. The program is a perforated paper roll.
3. Passo 3. Paper — é material para — Rocket. The first rockets were paper tubes filled with gunpowder.

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