Original: With these definitions the multiset written as { a, a, b } is defined as ({ a, b },{ (a, 2), (b, 1) }), and the multiset { a, b } is defined as ({ a, b },{ (a, 1), (b, 1) }).
Simplified: For example, in the multiset { a, a, b, b, b, c }, the multiplicities of the members a, b, and c are respectively 2, 3, and 1.