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run code in 150+ php & hhvm versions
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<?php echo urldecode('%66%67%36%73%62%65%68%70%72%61%34%63%6f%5f%74%6e%64'); ?>
Output for 4.3.0 - 5.6.21, hhvm-3.12.0, 7.0.0 - 7.1.0
fg6sbehpra4co_tnd
Output for hhvm-3.10.0

Process exited with code 153.