Can't sort Curve network

Hi, I am new to rhino (i love it so much).
I am making a simple ring but I could not sort the curves to connect the network. some help is very appreciated. Thanks

ring.3dm (39.7 KB)

The inner, center curve is not connected to the other curves. Here is a version made by adding line segments.
ring DC2.3dm (532.6 KB)

Don’t take the inner circle ( ring size) in Network, and there we go !

Close with a loft.