<?php 
    function punyaHuruf(string $kataPertama, string $kataKedua) {
        $kataPertama = strtolower($kataPertama);
        $kataKedua = strtolower($kataKedua);
        for ($i = 0; $i < strlen($kataPertama); $i++) {
            for ($j = 0; $j < strlen($kataKedua); $j++) {
                if ($kataPertama[$i] === $kataKedua[$j]) {
                    $status = true;
                    break;
                }
                $status = false;
            }
            if (!$status) break;
        }
        echo ($status ? "TRUE" : "FALSE"). "\n";
    }
 
?>

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

ICAgIAlwdW55YUh1cnVmKCdjYXQnLCAnYW50YXJjdGljYScpOwoJICAgIHB1bnlhSHVydWYoJ2NhdCcsICdhdXN0cmFsaWEnKTsKCSAgICBwdW55YUh1cnVmKCdjYXQnLCAnQU5UQVJDVElDQScpOw==

    	punyaHuruf('cat', 'antarctica');
	    punyaHuruf('cat', 'australia');
	    punyaHuruf('cat', 'ANTARCTICA');