South-pointing chariot and sickle: what they have in common

1. Step 1. South-pointing chariot — is a kind of — Cart. A cart.
2. Step 2. Cart — uses — Horse collar. The horse collar let horses pull heavy carts.
3. Step 3. Horse collar — uses — Domestication. The harness is put on a tamed horse.
4. Step 4. Domestication — uses — Sickle. Harvesting wild cereals with sickles.

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