Keep One from Unalike Dice

Hi all, trying to figure out if it is possible to do a keep one if I roll unalike dice. What works: /roll 3d4!!k1 - This rolls a d4 3 times, explodes on max roll, highest result is what is kept and matters. What I'd like to work: I'm trying to put in a way for the player to roll to attributes (for a saving throw), but they might not be the same value. So the player might role a d10!! and a d6!!, with the highest result being what is kept. We can obviously do this via visual inspection, but wondering if there is a way to code it in to do automatically. Thank you.

I might not be understanding 100% but the following would give you the highest result of the two exploding groups of rolls: /r { d10!!, d6!! }k1

Thanks Ziechael! That is what I asked, though apparently I didn't ask enough (my fault). I have the following macro: /roll ?{Ability Selection| Fortitude,1d@{mod-Strength}!! + 1d@{mod-Willpower}!!| Reflex,1d@{mod-Dexterity}!! + 1d@{mod-Perception}!!| Will,1d@{mod-Constitution}!! + 1d@{mod-Intelligence}!!} Wherein mod X has a value like 4, 6, 8, etc. What I'd like to do for those 3 saving throws is to keep the higher roll, instead of adding them together. I thought with just get the base code I'd be able to figure it out with variables, but I keep getting errors. Thank you for your reply.