Seven students, 'R', 'S', 'T', 'U', 'V', 'W', and 'X', are made to stand in a line in order of increasing heights (shortest student first). The statements below give information about the positions in the line:
(1) 'S' is the tallest student.
(2) 'W' is exactly between 'R' and 'U'.
(3) There are exactly three students between 'U' and 'X'.
(4) 'T' comes right after 'S' in height.
Question: How many arrangements of students are possible according to the given information?