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This document discusses for loops in CS111 Lab. It explains that for loops initialize a variable, check a condition, and increment the variable each iteration. Common uses include counting from 0 to n, counting backwards from n to 0, and incrementing by amounts other than 1. For loops are used when the number of iterations is known, while loops when it depends on user input. Nested for loops run one loop inside another, with the inner loop running fully each time the outer loop iterates.