Eoin Ó Broin (Dublin Mid West, Sinn Fein) | Oireachtas source

I have a couple of questions on section 110. With respect to subsections (3)(a), (3)(b) and (3)(c), I am unclear as to how these interact. I do not understand why, for example, in subsection (3)(a)(ii)(II) there is a four week period but in the subsequent 3(b) subsection there is a six week period. I am just trying to understand the interactions of these three subsections of the section.