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Consider the relational database of Figure 1. Give an expression in the relational algebra to express each of the following queries:

Find the names of all employees.

Find the names of all employees who live in city Miami.

Find the names of all employees whose salary is greater than $100,000.

Find the names of all employees who live in Miami and whose salary is greater than $100,000.

employee (person_name, street, city)

works (person_name, company_name, salary)

company (company_name, city)