Ten balls in a 3-Cascade, where they're all thrown as quadriplexes.
Essentially it's a superposition of two 3-Cascades SS:3 and two 2-Fountains SS:2T .
Very similar to the 7- and 8-ball Triplexed 3-Cascades SS:[32T2T] and SS:[332T] , this is probably the easiest ways of juggling ten balls. Remember to throw the crossing balls higher than the others.
As in the 8-Ball FountainSS:8 , the circles are stretched so tall and thin that there's very little free space to play with above you and collisions are very common. You really need to emphasise the "scooping" nature of the arms' throw movements.
You can, of course, practice 5-in-1-Hand SS:a0 on each side to improve the 10-Fountain SS:a .