permutations - Need to return unique user selections from multi select list box

Have a userform with a multi select list box with 3 bound columns from a row source that we want returned to a worksheet when the user selects multiple list box values. I can return the first value when it is a single list selection or I can return the values when using individual check boxes, with tons of conditional statements, but there are 300 unique row list box values so I'd appreciate any suggestions as to a cleaner solution.