[37] It is apparent from what we have said that we do not regard s.21AW(2) as requiring that a trial judge instruct the jury in the very words of the subsection. No doubt a verbatim declamation of the provision would be a sufficient compliance with it, but is not the only means by which the mandated instructions may be imparted to the jury. A judge in discharging the obligation imposed by the subsection should use the phrases found in it, in particular that the manner of giving evidence is "a routine practice of the court", and must tell the jury that they can not draw any inference as to the defendant's guilt because of the adoption of the routine. Some elaboration, if it be clear and not obscure, of these essential points may be helpful and will not invalidate the reception of the evidence. We are not sure that a jury would readily understand what is meant by "probative value", and some exegesis such as that given by the trial judge would probably be more useful to the jury than merely informing it in the terms of s.21AW(2)(b). As long as the essential point is conveyed that the evidence is not better or worse, or more or less valuable, by reason of being given in a particular way, that part of the statute will have been satisfied.