FOR counter = start TO finish [STEP increment]
Initiates a FOR-NEXT loop with the counter initially set to start and incrementing in increment steps (default is 1) until counter is greater than finish.
The increment can be an integer or a floating point number.
Note that using a floating point fractional number for increment can accumulate rounding errors in counter which could cause the loop to terminate early or late.
'increment' can be negative in which case 'finish' should be less than 'start' and the loop will count downwards. See also the NEXT command.
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