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The NEXT statement marks the end of an iteration and passes control back to the FOR statement to begin a new iteration.

Consider the following:

FOR n=a TO b STEP s

...

NEXT n

The 'a TO b' defines the range of values that will be assigned to n, starting with a. Each time the NEXT statement is encountered, n is incremented by s. If n is still within the bounds of the closed range [a:b], the loop performs another iteration, otherwise control passes to the statement that follows the NEXT statement.

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