Blend Surface Problem

Hi I’m trying to make the neck of the Duck of Level 1 Rhino6 exercises.
I need to use “blend surface” but in my model I have the joint of the surface of the original sphere down and does not allow me to select the first curve in its entirety. How can I correct it? Thank you!

Two alternatives:

  1. Use SrfSeam to move the seam of the sphere so it does not intersect the trimmed area.

  2. Use the ChainEdge option in BlendSrf

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Thanks so much!