When the umpires decide that a boat has broken rule 31, 42, C4, C7.3(c) or C7.3(d) she shall be penalized by signalling her under rule C5.2 or C5.3. However, if a boat is penalized for breaking a rule of Part 2 and if she in the same incident breaks rule 31, she shall not be penalized for breaking rule 31. Furthermore, a boat that displays an incorrect flag or does not display the correct flag shall be warned orally and given an opportunity to correct the error before being penalized.