How many countries have both written and unwritten constitution?

Countries typically have either a written constitution, an unwritten constitution, or a combination of both. The UK is often cited as an example of a country with an unwritten constitution, primarily based on statutes, conventions, and legal precedents. However, some countries may have written constitutions that include unwritten elements or rely on customary practices. Overall, the concept of having both written and unwritten aspects is more about the flexibility of constitutional frameworks rather than a specific number of countries.