[24] Of more assistance in the present case are the decisions of this Court in R v Tran[12] and R v Jimson.[13] In R v Tran a courier who imported 1,473 grams of heroin, who entered a plea of guilty to an ex officio indictment and who had no prior offences, was sentenced by this Court to 10 years imprisonment with a non-parole period of five years. In R v Jimson a courier who imported 1,686 grams of cocaine and made an early plea of guilty was sentenced to eight years imprisonment with a non-parole period of four years and six months. These decisions were concerned with the importation of drugs rather than their precursors, but the fact that the legislature has prescribed a maximum penalty of 25 years imprisonment as opposed to life imprisonment for the importation of drugs reflects the view (which is hardly surprising) that the level of criminality involved in the case of the importation of precursors with the intention of using them to make drugs is less serious, but not greatly less serious, than the importation of drugs. In the light of these decisions, it is, I think, impossible to maintain the argument that the sentence imposed in this case was excessive.