A wall and its roof
Build a wall that is ready for the next trade.
Brickwork needs materials, workers and access. The roof needs a wall with the right support and readiness. Connecting the packages must preserve those conditions.
Follow the construction into reusable work blocks, the meanings of their wiring and the repeated work that grows a wall.
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A correctly connected diagram and a satisfied readiness condition are different checks. Each essay states the construction rules it actually tests.