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Trace circles at all the external intersections

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You will have this result =

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It is still necessary for you to trace some at the place pointed by the arrows to finish this 3rd rotation =

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You finished the 3rd rotation; it remains you nevertheless to complete your drawing with the 16 outside half-circles,
such as traced in red, top, on the right =

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Start with the places indicated by the red arrows; they will show you the starting points for the half-circles of the green arrows.
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