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//https://css-tricks.com/snippets/wordpress/remove-li-elements-from-output-of-wp_nav_menu/

$menuParameters = array(
  'container'       => false,
  'echo'            => false,
  'items_wrap'      => '%3$s',
  'depth'           => 0,
);

echo strip_tags(wp_nav_menu( $menuParameters ), '<a>' );