randomizing blocks and response choice display

[kolenorberg]

I have a study with three passages which fall in one of 4 conditions. I want participants to see each passage in one of the conditions but I want whether or not they receive all conditions across passages to vary randomly. Something like the below code which doesn't seem to work. How can I accomplish something like this? Specifying a condition for all possible combinations here is a little unwieldy and wouldn't replicate a prior experiment well. 

"block_sequence": [{"$randomize":[
        {
        "A_C": ["A_full_control"],
        "A_E": ["A_only_easy"],
        "A_H": ["A_only_hard"],
        "A_HE": ["A_full_manip"]
      },
      {
        "C_C": ["C_full_control"],
        "C_E": ["C_only_easy"],
        "C_H": ["C_only_hard"],
        "C_HE": ["C_full_manip"]
      },
      {
        "D_C": ["D_full_control"],
        "D_E": ["D_only_easy"],
        "D_H": ["D_only_hard"],
        "D_HE": ["D_full_manip"]
      }]}

The other issue I'm having is more minor, but I'd like to have a passage and a comprehension question with answer choices on the same page. I want the passage below the question but that means I need to get the choice to appear between the two stimuli. Is there a way to do that? 
Thank you