Usually they’re more than 2 
Not only they’re pure (that doesn’t mean they didn’t had relationships with humans and Gods), they’re great tutors as well, they have been tutoring Gods and heroes after all such as Dionysus, Zeus, Hera, Persephone, Pan, Hermes. Gods were trusting their children to them and cities got names after them. They like dancing and singing, they are known for dancing in the forests along with Artemis and Aphrodite, even Apollo joined them.
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