The two yarns are run together.

My friend Sabrina has one of those sweaters that goes with everything and has proven to be the anchor of her wardrobe. But time marches on and sweaters need replacing. She asked for a copy. It’s such a nice sweater that I thought you might like it, too. This is a 3/4” sleeve on most people but a long sleeve on petites like Sabrina.
This sweater may be made on the standard gauge Japanese machines with ribber at about stitch size 8 or on the Passap at about stitch size 7.