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<?php echo cal_days_in_month(CAL_FRENCH, 13, 14);
Output for rfc.property-hooks, git.master, git.master_jit
Fatal error: Uncaught Error: Call to undefined function cal_days_in_month() in /in/2vhM7:3 Stack trace: #0 {main} thrown in /in/2vhM7 on line 3
Process exited with code 255.

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