If, on the trial of a person for perjury, the jury is satisfied that—
(a) the accused has made 2 statements on oath or under another sanction authorised by law, 1 of which is irreconcilably in conflict with the other; and
(b) the accused made 1 of the statements knowing it to be false;but the jury is unable to say which statement was falsely made, the jury may make a special finding to that effect and find the accused guilty of perjury.