11(c)

A ball shall be determined broken when it has a crack which extends through both its inner and outer surfaces. The ball may be squeezed by the Referee only enough to determine the extent of the crack. A broken ball shall be replaced, and the preceding point shall be a Let (See Rule 7(c)(6)).

[Gary Wong]

There is no Rule 7(c)(6). Should be Rule 7(c))5).