I would add the Regal and Kole Tang first, then once they've settled in add the Yellow and Blonde Naso. I doubt you'll see much for trouble as the 4 tangs you've selected aren't closely related to one another. If you do just tape a big mirror to the side of the tank for a week or so, they'll fight with themselves and eventually give up and should get along. (worked for my dwarf angelfish really well)
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