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add_action('sensei_before_main_content', 'my_theme_wrapper_start', 10);
add_action('sensei_after_main_content', 'my_theme_wrapper_end', 10);

function my_theme_wrapper_start() {
  echo '<div id="container"><div id="content" role="main">';
}

function my_theme_wrapper_end() {
  echo '</div><!-- #content -->
	</div><!-- #container -->';
	get_sidebar();
}