In these examples we select only some countries to print. A process that takes a list and selects only certain items is a "filter". Some get through, some don't.
You may need to review testing strings and numbers before you attempt these questions.
Print the countries where the region is Europe.
Print only those countries where the name ends with stan
Print only those countries where the name contains the letter z
Print the countries that have an area of less than 100.