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for variable = expression1 to expression2 [ step expression3 ]
statement(s)
next variable

The FOR and NEXT commands are used in conjunction to execute a command or group of commands a specified number of times. When the FOR command is first encountered, the variable is set to expresssion1.
After each NEXT command, variable is incremented by 1 (the default), or by expression3 if the optional STEP is used, until variable is greater than or equal to expression2 for positive step values, or less than or equal to expression2 for negative step values.