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
Many of Teresa's colleagues have written books. Most of the books they have written are on good writing. So some of Teresa's colleagues are good writers.