1. A trial court cannot impose a sentence exceeding the maximum prescribed by the statute under which an accused is charged. Where an accused is charged under section 4(4)(b) of the Firearms Act, the maximum imprisonment is 1 year, not the 5 years available under section 4(1). 2. Where an accused's criminal conduct constitutes one continuous transaction or single criminal enterprise, it should be charged as one count, not multiple counts. Pointing a firearm at multiple persons simultaneously as part of one escape attempt constitutes one criminal transaction, not separate offences for each person present. 3. When counts are reduced on review from multiple to one, the sentence must be proportionately reduced to reflect the reduction in the number of convictions. 4. The rule against duplication of convictions prevents multiplicity of convictions where the whole of the criminal conduct in substance constitutes only one offence, thereby avoiding prejudice to the accused.