Looping
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for ... next will loop from n to 1.

If you need to loop to something that isn't one, upwards, or with a step, recursion or a while loop is often easier and clearer:

10 for i negate 11 + 3 * 1 + foo next

4 begin dup foo 3 + 35 less drop while end then

4*f dup foo 3 + 35 less drop if f ; then drop

~/cf/looping.html