You're right - I didn't even think to specify this. There's no case in which the third value can be different among repeats, so it's not an issue. As to the order of the triplets, it would be the original one except for the "collapsed" ones.

Your solution looks great - thank you, much appreciated!

-- 
I hate storms, but calms undermine my spirits.
 -- Bernard Moitessier, "The Long Way"