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<?php if( have_rows('flexible_content_field_name') ): ?>
    <?php while ( have_rows('flexible_content_field_name') ) : the_row(); ?>

        <?php if( get_row_layout() == 'LAYOUT-NAME' ): ?>
        	<?php if( have_rows('NESTED-REPEATER') ): ?>
			    <?php while ( have_rows('NESTED-REPEATER') ) : the_row(); ?>

					<?php $image = get_sub_field('image'); ?>

				<?php endwhile; ?>
			<?php endif; ?>
        <?php endif; ?>

    <?php endwhile; ?>
<?php endif; ?>