Striking Fouls and Tripping
ARTICLE 2. a. No person subject to the rules shall strike an opponent with the knee; strike an opponent’s helmet (including the face mask), neck, face or any other part of the body with an extended forearm, elbow, locked , palm, fist, or the heel, back or side of the open hand; or gouge an opponent (A.R. 9-1-2-I).
I checked a few rulebooks back, and it's the exact same grammatical error - out of curiosity, what was the deleted/amended word after locked? Guessing arm?