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Thank you Michiel,

I don't actually require balance, just non-zero occurance of levels across blocks. I'll have a look at your suggestions.

Thanks,
Elisabeth

Dear all,

I am generating an efficient design for a project.

One of the key attributes that we are focusing on has 10 levels. Because this is an important attribute for us, we would like to have coverage (i.e. non-zero appearance of levels) for this attribute at both the aggregate and block level ...