Furthe to julies reply, I would tend to do it slightly differently. Firstly- although you say there are no dependancies, this does not inclkude resourcing. If you have a limit on resources (1 unit of both resources, being a person each) then this would affect the overall programme. I would tend to go with the split (4 tasks per person) and split these into 3 1-day and 1 2-day task. These can be linked to give a weeks duration (3*1 = 2) and resource A assigned to the first block, and resource B to the second.
For linking, I would link the second block as a start-to-start with the first, and then have both blocks lead to following activities. You can then either link block 1 from a predecessor or put in a start date, and everything else will follow logically.

I realise this does seem a bti more complicated and possibly overkill, but I like to ensure that everything is as clear as possible- clients get itchy in my trade (construction) if they cant see everything. It also means that should a task get missed, forgotten, or overrun, it is easy to amend the programme to reflect this and shw exactly where the additional time came from- useful for EoT, claims etc.
as I said, my line of work demands a very transparent programme with more detail that is really necessary to allow full analysis of changes, but the principle still stands