It was contended by counsel for the defendants that, at least in relation to the first limb of the expression "liable to be prohibited from entering the Commonwealth," the context did require this meaning and that "liable" should be given the same meaning in both limbs. For the reasons already given, in January 1947 the plaintiff was no longer exposed to the risk of becoming a prohibited immigrant under s. 3. But I agree that if "liable" in relation to liability to be prohibited from entering the Commonwealth means exposed to liability, this would tend to show that "liable" in relation to liability to be prohibited from remaining in the Commonwealth has the same meaning, although it is not unknown for a word to have different meanings in different sections of an Act or even in the same section: Halsbury's Laws of England, 2nd ed., vol. 31, p. 482. But in my opinion there is no sufficient context to indicate that "liable" in either limb of the expression has the wider meaning. The context seems to tend to the contrary. There is, for instance, s. 4 (6) which provides that where a person enters the Commonwealth from any vessel in pursuance of the section a penalty shall not attach to the vessel or its master, owners, agents or charterers in respect of such entry. The master, owners, agents or charterers of a vessel could only be prosecuted under s. 9 where a prohibited immigrant entered the Commonwealth from the vessel such as an immigrant who had been required to pass a dictation test and had failed to do so or had failed to produce a landing permit or a passport upon demand by an officer. The vessel, its master, owners or charterers would therefore only require to be protected by a certificate of exemption from the entry into the Commonwealth of such a person and not from the entry into the Commonwealth of a person who had not been required to pass a dictation test or to produce a landing permit or passport. There is also s. 7 which provides that every immigrant entering the Commonwealth in contravention or evasion of the Act and every person who, by virtue of the Act, is deemed to be a prohibited immigrant offending against the Act (for instance, a person who is required to pass a dictation test under s. 5 (2) and fails to do so) shall be liable upon summary conviction to imprisonment for not more than six months and shall be liable pursuant to any order of the Minister to be deported from the Commonwealth. There can be no doubt that in s. 7 "liable" means liable as a person who is a prohibited immigrant or a person who is deemed to be a prohibited immigrant offending against the Act, and I can see no reason why "liable" in this section should have a different meaning to liable in s. 4 (1). The words used in s. 4 are "is liable" and not "would be liable" and the use of the present tense points strongly to an actual accrued liability. A person does not require a certificate of exemption unless he is a prohibited immigrant or person deemed to be a prohibited immigrant offending against the provisions of the Act and this indicates that the word "liable" in the expression is used in its ordinary natural grammatical sense and refers to a person who is, at the time he applies for a certificate, a prohibited immigrant or deemed to be a prohibited immigrant offending against the provisions of the Act and as such liable to be prohibited from entering or remaining in the Commonwealth without a certificate.