The answer
Yes, you can nest as many loops as you want. However, nesting three or more loops creates devastatingly slow code and is rarely the optimal solution.
What is a Nested Loop and When Do You Need It?
Can I nest more than two loops?
More FAQs in What is a Nested Loop and When Do You Need It?
A nested loop is a loop construct (like a for or while loop) placed completely inside the body of another loop.
For every single iteration of the outer loop, the inner loop executes its entire cycle from start to finish.
They are primarily used to traverse multi-dimensional data (like matrices) or to compare every element in a list against every other element.
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