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 fewer 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 :

LongwordNumber = (E div 32);

and the bit number within that 32-bit value is given by:

BitNumber = (E mod 32);