There are 6 pieces of blue and white porcelain: S, Y, M, Q, K, X  The age of each piece is different, and the exhibition is sorted from the earliest to the latest from left to right  The known conditions are as follows: (1) the age of M is earlier than that of X  (2) if the age of Y is earlier than that of M, then the age of Q is earlier than that of K and X  (3) if the age of M is earlier than that of Y, then the age of K is earlier than that of Q and X
(4) the age of S is either earlier than Y or M, and it can't have both
Y,S,M,X,Q,K.