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BIBD design with varying attribute levels

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BIBD design with varying attribute levels

I am designing a discrete choice experiment. I want to create profiles which exist of 4 attributes. 

I have 7 attributes, 3 with 2 levels, 3 with 3 levels and 1 with 4 levels.

I need to take two steps:

Step 1: Determining the constant attributes in each choice set, I want 4 of the 7 attributes in each choice sets.

I created a BIBD with %mktbibd

No i am arrived at step 2, how can I determine the attribute levels of this BIBD design (balanced and orthogonal)?

Step 2: Determining the levels of the non-constant attributes.

Can someone help me with step 2?

Thx!

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