Cuneiform and steam locomotive: what they have in common

1. Step 1. Cuneiform — uses — Clay. The signs were pressed into wet clay.
2. Step 2. Clay — is material for — Kiln. Kilns were built of clay.
3. Step 3. Kiln — has part — Chimney. The chimney creates a draught.
4. Step 4. Chimney — is part of — Steam locomotive. Smoke from the firebox leaves through the locomotive's chimney.

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