A certain number of persons sit in a linear row, all facing north. The following conditions are given: P sits third to the right of S. - Exactly three...

A certain number of persons sit in a linear row, all facing north. The following conditions are given:

• P sits third to the right of S. - Exactly three persons sit between P and Q. - U sits third to the left of Q. - U is fifth from the left end of the row. - R sits third to the left of U. - Exactly three persons sit between W and T, and T is an immediate neighbor of R. - Exactly six persons sit to the right of W. - M sits immediately to the left of O. - Exactly three persons sit between M and H. - O does not sit to the left of P. - H does not sit at the extreme end of the row.
  Four of the following five are similar in a certain way and form a group. Which one does not belong to the group?