Who is who?

Logic Level 3

On an island there are 3 types of people: knights that always tell the truth, knaves that always lie, and jesters that tell the truth only after a lie and vice versa.

While you are on the island, you come across an old man, a boy, and a girl.

Old man: "I am a jester." "The boy is a knight."
Boy: "I am a knight." "The girl is a jester."
Girl: "I am a knave." "The old man is a jester."

How many jesters are there among the three?

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