Which stack contains maximum number of boxes? 

Study the following information carefully and answer the below questions. There are certain numbers of boxes which are placed in three stacks – stack 1, stack 2 and stack 3 from West to East. At least two boxes are placed in each stack. Each stack has seven shelves in such a way that the lowermost shelf is numbered 1, the shelf immediately above lowermost shelf is numbered 2 and so on... No two boxes are placed in the same stack in same shelf. Five shelves are between box Q and box U but not placed in the same stack. Box T and U are not placed in same stack. Box T is placed in stack 1. Box P is placed south east of box V and west of box W. Box V is not placed at top most position. Box X is placed two places above box W in same stack. Box Q is in north east direction of Box R. Two shelves are placed between S and P. Box S is placed east of box U. Box T is placed at even number position. More than Two known boxes are placed in left most stack. Box R is placed three shelves above box T.