Where, on a transfer of property, an interest therein is to accrue to a specified person if a specified uncertain event shall happen, and no time is mentioned for the occurrence of that event, the interest fails unless such event happens before, or at the same time as, the intermediate or precedent interest ceases to exist.

Where, on a transfer of property, an interest therein is to accrue to a specified person if a specified uncertain event shall happen, and no time is mentioned for the occurrence of that event, the interest fails unless such event happens before, or at the same time as, the intermediate or precedent interest ceases to exist.