91. Alternative limitations.

Either of two limitations which are expressed to take effect independently and in the alternative may take effect notwithstanding that the other is void1. Similarly, an ultimate limitation creating a future interest which becomes vested in interest within the limits of the rule against perpetuities is valid, although preceded by, but wholly independent of, earlier trusts which are avoided by the rule2.

A single gift which is expressed to be limited contingently on one or other of two or more separate events, of which one is too remote under the rule and the other not, may take effect on the