Using Test Slices

[#1]

I just had a curiousity about interpretting a test slice result. I have data collected that is repeated over multiple days but my main interest is what occured within each day which is why I use the test slice.  Lets say I have this in the slice for a day:

Level 1      -1      -1      -1

Level 2       1      

Level 3                1

Level 4                          1

If I am thinking of this correctly this is only testing Level 1 vs. Level 2,  Level 1 vs. Level 3, Level 1 vs. Level 4 but it is not testing interactions between the other levels and I am interested in all of the interactions among the levels within each day and knowing if there is any difference. So what is the best way to achieve this?

[#2]

I should also add this an interaction term that uses three components, so each level consists of a location * day * treatment.