The Shii-Cho Knight talent name should read SUN DJEM not SUM DJEM. I know its a spelling error in the talent tree at least. Don't have the book.
Sun Djem
It's spelled as Su m Djem throughout the book, at least on pages 44 (Niman Disciple, Column 1/Row 4), 52 (Makashi Duelist, Column 2/Row 5), 64 (Shii-Cho Knight, Column 4/Row 4), and 109 (Talents chapter).
Edited by Donovan MorningfireDarn. I guess its wrong everywhere in the book. Can't wait to get my hands on a book not being sold by a holonet Hutt.
Or it could be that for "reasons" it turns out the correct spelling according to the Lucasfilm Archive is Sum Djem, much as those same archives said that WotC had over-estimated the size of the HWK-290 freighter, which should have been around the size of a starfighter instead of being on par with the Falcon in terms of length.,