Each of the following questions is based on the following information:
Six flats on a floor in two rows facing North and South are allotted to P, Q, R, S, T and U.
Q gets a North facing flat and is not next to S.
S and U get diagonally opposite flats.
R next to U gets a south-facing flat and T gets North facing flat.
The flats of which of the other pair than SU, is diagonally opposite to each other?