Loop through check boxes, results in 1 cell

hi,
i have the following code which loops through all checkboxes and puts the value in cell A1.
however, i dont know how to change it for when multiple check boxes are ticked. i want the final result to be all shown in the one cell regardless of how many boxes are ticked. i would like them seperated by a comma.
example, if 3 boxes are ticked then cell A1: result1, result2, result3

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Genius!

Thanks a bunch