 For instance, if a subroutine for calculating the square root of a number is in page 3, one might have three lines of code 3.1, 3.2 and 3.3, and it would be called using The code would return to the statement after the Do when it reaches the next line on a different page, for instance, 4.1.There is no need for the equivalent of a at the end, although if an early return is required, accomplishes this.Every line must start with a command keyword following the line number.