How to merge two curves into one, to use as a rail for sweep1

Hi there, I searched for answers about how to merge two curves into one entity, so I can use it as an input to sweep1. Most of the answers are about bridging a gap between curves, but in my case the two curves are continuous. I also found some code referring to rhino.JoinCurves, but I can’t quite find this as a stand alone command. Worse, I did have a solution a year ago and now I can’t remember!
The curves in question are in red in my drawing.
B5.3dm (256.9 KB)

Thank you,
Marco

it is just JOIN!!! Solved. Silly me…

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