on the nth day of christmas my true love gave to me
on the zeroth day of christmas my true love gave to me
the set containing nothing
on the first day of christmas my true love gave to me
the set containing the set containing nothing
on the second day of christmas my true love gave to me
the set containing:
- the set containing the set containing nothing; and
- the set containing nothing
on the third day of christmas my true love gave to me
the set containing:
- the set containing: the set containing the set containing nothing, and the set containing nothing;
- the set containing the set containing nothing; and
- the set containing nothing
on the fourth day of christmas


















