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<?  #$wphelper->filterBlogPost($wphelper->makeExcerpt($post['post_content'], 21,$wphelper-> blogPageUrl($post)))?>
based on ImpZr
Output for 5.4.0 - 7.1.7
Notice: Use of undefined constant   - assumed ' ' in /in/q1SIU on line 2
Output for 4.3.0 - 5.3.29
<?  #$wphelper->filterBlogPost($wphelper->makeExcerpt($post['post_content'], 21,$wphelper-> blogPageUrl($post)))?>