There does seem to be a sequence of
V u T s R q P
The difference between V and T is 38 ( 19 x 2 )
The difference between T and R is 80 ( 20 x 4 )
Could the difference between R and P be 168 ( 21 * 8 ) OR 126 ( 21 * 6 )
If I'm right, I think the sequence is too short to say whether it should be 6 or 8.
Also is there any logic to U=19 and S=20.
Or am I totally wrong? Probably.