Can You Mix Vaccines Safely?

We're doing a grid of mix and match. It's called whereas you take people that have either gotten moderna, fise or j and jay,. You give them the third dose for an m r ana and a second dose for j and j. Is it safe and does it induce an immune response that you would predict would be protective? We are not doing the mixing match yet. For asterzendica, the brits have done that, so the data from the britS have done that - and it looks like there is no problem there at all.