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Crucible and Charcoal

Edit: Charcoal is Wood + Fire.

Crucible is concrete + stone / gravel + clay (if you do "gravel + clay" put the gravel in the left slot and the clay in the right or you'll get a whetstone) / concrete + sand / clay + stone / gravel + concrete

Concrete is gravel + water

Gravel is stone + electricity

Clay is water + sand

And sand is stone + water / stone + air