CSet:Count
The Count method returns the number of images in the CSet.
| nCount = CSet:Count() where | 
 nCount is the number of members in the set. On
failure, 0. is returned.
    nCount is the number of members in the set. On
failure, 0. is returned.
Suppose a CSet assigned to S contains 5 strings. Then
returns the value nStrings = 5.