Loops can be nested to define more complex measurements. Nesting is accomplished by placing one loop inside another and iterating through that one loop completely for every iteration in the other loop.
When nesting, only the innermost (leaf) loop contains points, while the outer loop(s) just move through measurement states without counting.
Note: Unlike with sub-loops, nested loops require that you open a loop block that is a level of indentation deeper than the preceding loop. Every time you wish to embed another loop inside a given loop, you must indent another level.