If--
(a) a number of persons are severally indicted for perjury or false swearing, and
(b) the statements alleged to be false--all of those persons may be tried together, at the same time and before the same jury, provided that each person is to have his or her full right of challenge.(i) are alleged to have been made on the same occasion, before the same court or tribunal and in respect of the same subject-matter, and(ii) are in each case to the same effect, whether in identical terms or not,