Each of the following are the cases mentioned in section 21 (5) of absence by the employee concerned from work immediately before the relevant public holiday:

1. such an absence, in excess of 52 consecutive weeks, by reason of an injury sustained by the employee in an occupational accident (within the meaning of Chapter 10 of Part II of the Social Welfare (Consolidation) Act, 1993),

2. such an absence, in excess of 26 consecutive weeks, by reason of an injury sustained by the employee in any accident (not being an accident referred to in paragraph 1) or by reason of any disease from which the employee suffers or suffered,

3. such an absence, in excess of 13 consecutive weeks, caused by any reason not referred to in paragraph 1 or 2 but being an absence authorised by the employer, including a lay-off,

4. such an absence by reason of a strike in the business or industry in which the employee is employed.