Glass of water e hammer: o que têm em comum

1. Passo 1. Glass of water — é material para — Pão. It binds the dough.
2. Passo 2. Pão — utiliza — Quern. Flour was ground on millstones.
3. Passo 3. Quern — é um tipo de — Stone tool. A quern is two stones: the upper one is turned on the lower to grind grain.
4. Passo 4. Stone tool — evoluiu para — Hammer. The first hammer was a stone in the hand.

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