123. The period referred to in subparagraph b of paragraph 2 of section 55 of the Individual and Family Assistance Act (chapter A-13.1.1) begins on the date on which the work ceases, and it ends,1° in the case of an initial application for benefits, at the end of the fourth week following the date on which the benefit period began;
2° in the case of a subsequent application for benefits, at the end of the third week following the date on which the application took effect;
3° in the case of a decision not made by the Canada Employment Insurance Commission, at the end of the fourth week following the date on which the application for benefits was made;
4° in the case of a predated application for benefits, at the end of the second week following the date on which a request to that effect is accepted; and
5° in the case of an interruption in the regular benefit payment, at the end of the week in which the benefit payment was due.