How many persons live between S and Z?

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Question

Study the following information carefully and answer the question given below: There are seven people Y, Z, P, S, M, N and K are living in a 7 floor building on different floors from top to bottom (such as ground floor is numbered as 1 and top floor is numbered as 7) but not necessarily in the same order. Y lives on the 2nd floor. M live immediately above N. Z live above N. Y lives immediately above S and immediately below K. There are four persons live between S and P.