The selection of a single instance within the period covered by any one count avoids a position such as that in S. v R. in which, as Gaudron and McHugh JJ. put it at 286, '[e]ffectively, the applicant was required to defend himself in respect of each occasion when an offence might have been committed'. By tying itself to the 'first occasion' of an offence charged by the presentment and described in the particulars, the Crown undertakes to prove that the offence charged occurred during the period specified, and to prove also that no offence answering the given description occurred earlier, whether within the specified period or outside it. It is further to be noted that in S. v R. (so far as appears) the only charges against the accused man were of sexual intercourse, each on a date unknown within a specified period of 12 months; but that evidence was given by the complainant of many acts of intercourse by the accused with her, the physical circumstances of any one of which were (again, so far as appears) indistinguishable from those of any other, save for the two occasions that I have already noted. One of these was the 'first occasion', but that characteristic was of no use by way of particularisation because the first occasion was not necessarily the subject of one of the three counts. Here, by comparison, the act on the 'first occasion' is specifically charged and, moreover it is charged alone. Again, the circumstances alleged here in respect of any one count of sexual abuse of the complainant are readily distinguishable from the circumstances alleged in respect of any other such count. I note also that the periods specified in the particulars to counts 3, 4, 5, 6, 7 and 8 vary between one month at the least and five months at the most. This is to be compared with the position in S. v R., where the period in respect of each count was 12 months, and there was evidence of a number of instances of sexual intercourse, from which the jury was invited to select, occurring over a total period of almost three years: cf. at 286, per Gaudron and McHugh JJ.[13]