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// Include Field
<?php the_field('projectPage_sub_title'); ?>

// Check if field exist
<?php if (get_field('projectPage_gallery')): ?>

  // ACF Repeater loop
  <?php while ( have_rows('repeater_') ) : the_row(); ?>
    
    // Include sub field
    <?php the_sub_field('projectPage_gallery_item'); ?>
    
  <?php endwhile; ?>
  
<?php endif; ?>