I think that you guys both correct in what you intended to say, but you appear to be misunderstanding each other.
Candidates start with 6 sittings available. Each sitting lasts for the duration of one examination week. Each exam can be attempted only once during a given sitting.
All 14 exams must be passed within the six sittings.
Within the 6 sittings candidates are permitted a maximum of 4 attempts at each of the 14 exams.
When for example, a candidate has used up the first three sittings, he/she has only three sitting left. This means that for any exams not attempted during these first three sittings, there is now only 3 attempts left. If a candidate were to use up all 6 sittings without attempting one or more of the exams, he/she would have no attempts left for those exams.
The bottom line is that candidates are constrained by whichever limit they hit first ( 6 sittings or 4 attempts at each exam).
If all 14 exam have not been successfully taken (passed) with the limits of 6 sittings and/or 4 attempts, then all passes are lost and the entire exam sequence must be started again.