Preview:
<?php

if( have_rows('your_group') ): while ( have_rows('your_group') ) : the_row(); 

    if( have_rows('your_repeater') ): while ( have_rows('your_repeater') ) : the_row();       

        echo get_sub_field('repeater_sub_field');

    endwhile; endif;

endwhile; endif;

?>
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