Paper bag side gussets e hammer: o que têm em comum

1. Passo 1. Paper bag side gussets — faz parte de — Paper bag. They let the bag fold flat.
2. Passo 2. Paper bag — é feito de — Paper. Paper.
3. Passo 3. Paper — é material para — Lança de fogo. The barrel of a fire lance is a paper or bamboo tube.
4. Passo 4. Lança de fogo — evoluiu de — Spear. The fire lance was a spear with a tube of gunpowder — the first step to firearms.
5. Passo 5. Spear — tem como parte — Stone tool. Early spearheads were made of stone.
6. Passo 6. Stone tool — evoluiu para — Hammer. The first hammer was a stone in the hand.

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