Postal service e barril: o que têm em comum

1. Passo 1. Postal service — utiliza — Steam locomotive. Mail trains.
2. Passo 2. Steam locomotive — tem como parte — Chaminé. Smoke from the firebox leaves through the locomotive's chimney.
3. Passo 3. Chaminé — é feito de — Tijolo. Chimneys are brick.
4. Passo 4. Tijolo — é material para — Arco. Arches were built of brick or stone.
5. Passo 5. Arco — funciona como — Barril. Staves squeezed by hoops hold their shape by the same compression as the stones of an arch.

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