Saddle tree frame e lead–acid battery: o que têm em comum

1. Passo 1. Saddle tree frame — faz parte de — Saddle. The saddle tree.
2. Passo 2. Saddle — é feito de — Leather. A saddle is made of leather.
3. Passo 3. Leather — é material para — Submarine. It was covered with leather.
4. Passo 4. Submarine — tem como parte — Lead–acid battery. Underwater, electric motors run on batteries.

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