Eventually, you will find the empty set.

random

Siege of Jerusalem (587 BC) (Wikipedia) The siege of Jerusalem (c. 589–587 BC) was the final event of the Judahite revolts against Babylon, in which Nebuchadnezzar II, king of the Neo-Babylonian Empire, besieged Jerusalem, the capital city of the Kingdom of Judah. Jerusalem fell after a 30-month siege, following which the Babylonians systematically destroyed the city and Solomon’s Temple. The Kingdom of Judah was dissolved and many of its inhabitants exiled to Babylon.

Empty set (Wikipedia) In mathematics, the empty set is the unique set having no elements; its size or cardinality (count of elements in a set) is zero. Some axiomatic set theories ensure that the empty set exists by including an axiom of empty set, while in other theories, its existence can be deduced. Many possible properties of sets are vacuously true for the empty set.