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Obbliq:  Calculating PI (not very precise!)
Filling the semi-circle and the upper cells until the liquid don't boils.
Clearing the upper line of liquid blocks.
Pouring to the measurement container.
The amount of liquid must be: x = (1/2)* PI * 1.5^2
If the amount of liquid is x; PI= x * 2 / 1.5^2

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