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<?php $s='Ceam mai frecventa litera este , frecventa fiind de'; $a= explode('',$s); var_dump($a); var_dump(sort(array_unique($a)));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught ValueError: explode(): Argument #1 ($separator) cannot be empty in /in/Wr7Uu:4 Stack trace: #0 /in/Wr7Uu(4): explode('', 'Ceam mai frecve...') #1 {main} thrown in /in/Wr7Uu on line 4
Process exited with code 255.

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