In an Act dealing with shop trading hours, the use of the word "exempt" without qualification indicates in our view an intention that an exempt shop should stand outside the regime with respect to shop trading hours which the Act lays down. The use of that word certainly does not suggest that the power to issue a certificate of exemption was intended to be a power to lay down an alternative regime in relation to trading hours. True it is that a certificate of exemption may be subject to specified restrictions and conditions, but a partial exemption, that is, an exemption confined to particular hours on a particular day of the week, can hardly be regarded as a complete exemption subject to a restriction or a condition. The type of restriction or condition contemplated by s 5 may be seen from the restrictions or conditions imposed by the certificates in this case. Moreover, in the definition of exempt shop in s 4(1), all of the categories of exempt shops, apart from that in question, are defined, not by reference to trading hours, but by reference to such considerations as floor area and the nature of the goods or services offered for sale. It would be incongruous if the category of exempt shops constituted by "a shop in relation to which a certificate of exemption, issued by the Minister, is in force" could be afforded a partial exemption defined by reference to trading hours. Furthermore, specific provision is made by s 13a for the Minister to grant a permit to certain types of hardware shop to trade on Sundays and other public holidays. Similar provision is made in s 17 for the Minister to grant licences permitting the sale of motor spirits and lubricants on Sundays and other public holidays. Those provisions would be unnecessary were s 5 to be construed as the Minister seeks to construe it.