Jokers always lie. Clowns always tell the truth. A group of four, each of whom is a Joker or a Clown, make the following statements about each other: P says, 'Q always lies'; Q says, 'R always lies'; R says, 'P always tells the truth'; S says, 'Exactly two of P, Q and R are Jokers'. How many of P, Q, R and S are Clowns?
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