A set is stored as an array of bits, where each bit indicates if the element is in the set or excluded from the set. The maximum number of elements in a set is 256.
If a set has less than 32 elements, it is coded as an unsigned 32-bit value. Otherwise it is coded as an array of 8 unsigned 32-bit values (longwords), and hence has a size of 256 bytes.
The longword number of a specific element E is given by :
and the bit number within that 32-bit value is given by: