Perforated piano roll y cohete: qué tienen en común

1. Paso 1. Perforated piano roll — forma parte de — Pianola. Perforated paper with the tune recorded on it.
2. Paso 2. Pianola — está hecho de — Papel. The program is a perforated paper roll.
3. Paso 3. Papel — es material para — Cohete. The first rockets were paper tubes filled with gunpowder.

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