I want to know the answer to the following question:
How many kingdoms have buildings present in the Durbar Square of Kathmandu?
All the background I'm provided with is that "The Durbar Square of Kathmandu is located in the old city and has heritage buildings representing four kingdoms (Kantipur, Lalitpur, Bhaktapur, Kirtipur); the earliest is the Licchavi dynasty.". Is that enough to answer the question?