If the Program specifies a version number of this License which applies to it and "any later version", you have the option of following the terms and conditions either of that version or of any later version published by the Free Software Foundation.
"Debian GNU/Linux: Guide to Installation and Usage"
John Goerzen and Ossama Othman
If he requires any other kind of two-people-act, he specifies the kind of two-act of which he is in need.
"Writing for Vaudeville"
Brett Page
Cicero specifies among the qualifications of a speaker, 'Vox tragoedorum, gestus paene summorum actorum.
"The Roman Poets of the Republic"
W. Y. Sellar