5. Retraite Québec may make regulations excepting:(a) any employment if it appears that, by reason of the laws of Canada, another province or another country, a duplication of contributions or benefits would result;
(b) any employment by an employer resident outside Québec unless arrangements satisfactory to Retraite Québec have been made for the payment of contributions in respect of such employment;
(c) the entire employment under one employer of a person who is employed by the employer partly in pensionable employment and partly in excepted employment;
(d) any employment similar to excepted employment;
(e) employment whose performance and remuneration are analogous to the carrying on of a business;
(f) employment of a casual nature or of short duration.