Martha' s friend, who is very knowledgeable about edible flowers, told Martha that there are no edible daisies, at least not any that are palatable
Martha, however, reasons that since there are daisies that are a kind of chrysanthemum and since there are edible chrysanthemums that are quite palatable, what her friend told her must be incorrect
Most of Leon's friends are good swimmers, and good swimmers are quite strong. So it is likely that at least some of Leon's friends are quite strong.