Directly or indirectly coupled multigroup diffusion?

[Gavin Ridley]

Hi all (maybe just Alex),

Just wondering, it looks like many examples are only two group diffusion right now. If people want to go to greater group numbers in the future, will the downscattering have support for indirect coupling like group 1 into 3? Or will it be only direct, like 1->2->3->...?

Have a nice day,

Gavin Ridley