Seven friends, Rishi, Param, Sudhir, Danish, Nishi, Kashish, and Ram, are sitting in a straight line facing the north. Param sits second to the right of Sudhir. Only two people sit between Param and Kashish. Only one person sits to the right of Kashish. Nishi sits to the immediate left of Rishi. Ram does not sit on any of the extreme ends. Three of the following four are alike in a certain way based on the given arrangement and thus form a group. Which is the one that does not belong to that group?