Please use the complete day and letter:
WEDNESDAY (A)
THURSDAY (B)
FRIDAY (C)
SATURDAY 2 PM (D)
SATURDAY 6:30 (E)
 
DVD 1 is the first DVD, the plus is when you want more than one!  Ordering 2 DVDs of A & B, you would choose DVD 1+1.  If you wanted A, B & C that would be DVD 1 + 2....