The pattern of the sleeve of right and left is the same.Distribute the 14 stitches from your scrap yarn onto three double pointed needles.（3 mm needle）Join new yarn, Pick up 4 stitches at underarm.The end of connected yarn is reserved on the face.
Then k2tog(with the stitch<make one>which you picked with the left needle)
k12,sL1k(slip 1 stitch knitwise)
The next work begins to pick up yarn under the first stitch of the next needle,and makes 1 stitch. The stitch is twisted. and it's to the right needle.
Then you cover the stitch with the right stitch(slip 1 stitch knitwise),
k2,pm(A marker is in the middle of the underarm)
Bind off in purl stitch. 4.5mm of needle.
Please stitch a hole by reserved yarn.