How to convert a 3DPolyline into a 2D one

[Karol-Or]

I SPEDITed a non planar spline into a polyline, it came out a 3DPolyline

I FLATTENed it and it became, again, a 3DPoly

I exploded and JOINed back, again a 3DPoly

How do i turn it into a 2DPoly

It would have been best if i could change the original non-planar spline into a planar one

[cadffm · Accepted solution]

Without testing:
Explode
Flatten
Join