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I have grown both Chem 4 and Chem 91. I have heard one is and indica and one is a sativa. Don't know about that but both were keepers in my books. The 4 yielded better but if you topped it and then fem topped it before switching to flower it did yield better. Good smoke imo and holds up well against most anything. I still have some 91 seeds.
I haven't grown either for a while now but reading this thread makes my taste buds water......