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6 inventions to master first, in an order where each one only needs those before it.
The first cutting edge
Light, heat and cooked food
Clay turned to stone by fire
needs 2
Wood cooked slowly under earth
needs 1, 2
Raw hide, oak bark and months in pits
Copper and tin, harder together
needs 2, 3, 4
Water raised by valve and piston
Goal · needs 5, 6
Type a name, a date, a material, a domain…