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Dear Jill, dear FSL experts, following the very helpful guide by Jill O'Reilly I want to set up a PPI analysis for a dataset with 4 conditions (A, B, C, D). For the PPI analysis, I am interested in A-B. The PPI FAQs says that I should not include A and B (the design will be rank deficient), but A+B (to soak up shared variance). Now I am not sure what to do with my conditions C and D. Should I include them as separate EVs of no interest (C, D)? Many thanks Carsten