Poker Book Mistake

In Championship 7-Stud: High, High-Low, Razz by Linda Johnson, Tom McEvoy and Max Stern there is a mistake on page 20.  McEvoy is discussing three card starting hands in 7-stud/8.  He says, 'Two aces with a baby card, especially if it is a wheel card, is an extremely strong starting hand."  Then he says, "If it is double-suited, so much the better...."  !!!  How can three cards be double suited????!!!!