For repeated triples and quads, we've seen some skaters make the second one in combination and I don't understand why they choose to do that.
For example, some skaters do 3A then 3A+2T.
That way, if you miss on the second 3A(step out or fall, etc...) and fail to put 2T, you will lose a base valut of 2T and 20% of the base value of 3A for not making it in combination(3A, 3A+SEQ).
This may cause you to make another individual jump in combination in order to make up the mistake, then that jump combination will be counted as a 4th combination jump element.
If you plan to make the first 3A in combination(3A+2T, 3A), you will have a chance to make the second 3A in combination in case you miss it, but if you plan to make the second one FROM THE BEGINNING(3A, 3A+2T), you can not make it up and lose a lot of points.
If you do the secont one in the last half of the program, you will get some extra point, but the difference is not big(only 0.13 if you only put +2T). Unless you're really confident in landing both, I don't think it's worth risking to do.