Nested for loops

Introduction

A nested loop has one loop inside another. When a loop is nested inside another loop, the inner loop runs many times inside the outer loop. In each iteration of the outer loop, the inner loop will be restarted. The inner loop must finish all of its iterations before the outer loop can continue to its next iteration.

For example, the outer loop iterates $5$ times, and the inner loop iterates $6$ times when run independently. This means that the inner loop will iterate for a total of ...