Need Help With Pattern

[je0619]

I am doing a dog sweater that has skull and crossbones on the back and I need help on the legs part. Here is how the pattern reads:

Shape Leg Openings and Place Chart:
1st row: K4 (5-6-10). Cast off next 4 (5-6-9)
sts. K8 (12-14-27) (including st on needle after
cast off). Work Chart A (A-B-B) across next 20
(20-26-26) sts reading row from right to left.
K8 (12-14-27). Cast off next 4 (5-6-9) sts.
Knit to end of row.

Can anybody help me understand this? You all are so nice to help when I have needed it!

Staci