premise: Rachel Green is one of the six main characters in the sitcom Friends.
hypothesis: Rachel Karen Green is a fictional character , one of the six main characters who appeared in the American sitcom Friends . The role of Rachel was originally offered to actresses Téa Leoni , the producer 's first choice , and Courteney Cox , both of whom declined , Leoni in favor of starring in the sitcom The Naked Truth , and Cox in favor of playing Rachel 's best friend Monica in Friends .