Hello Dr. Sereda, I have a quick question about multiple substituents on benzene rings. If you have two substituents that are donors, how you can tell which is the more activating donors group? (The resonance donor wins - GS). For instance, if you had a OH and a methyl group in the para positions to each other, (OH-group will determine orientation - GS).  how would you know where the incoming substituent would attach? (ortho-position with respect to the OH-group - GS).