Arc between two arcs

Hello, I need to create an arc in between to other arcs and I don´t know how to do it.It needs to do like this.

Curve/Spline/Tween Curve.

Arc between.gh (2.9 KB)

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If the upper curve is actually separate curves, join them first with Join Curves. Then put the joined uppper curve with the bottom curve into a Tween Curve, reparamterizing their inputs.

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