Question
Quatrefoil - Четырехлистник
A Quatrefoil where |L1-L2+L3-L4|=const. L1, L2, L3 and L4 - distances between 4 focuses and the curves

A Quatrefoil where |L1-L2+L3-L4|=const. L1, L2, L3 and L4 - distances between 4 focuses and the curves

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