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.