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<?php print substr(0, 1, 'USP');
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: substr(): Argument #3 ($length) must be of type ?int, string given in /in/IqAY7:3 Stack trace: #0 /in/IqAY7(3): substr('0', 1, 'USP') #1 {main} thrown in /in/IqAY7 on line 3
Process exited with code 255.

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