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I want to sign up to this website that has an English version, but unfortunately, the captcha for it is Japanese. I can't read Japanese and no online translator seems to be able to make sense of the 2nd line. Here it is:

表示されている数式を計算して、半角数字で答えを入力してください: 必須(半角数字)

ろクタスナナは

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Why is this an effective captcha?

I'd also like to know the meaning, the translation, and why no translator seems to be able to translate that last word.

Thanks.

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    It is an effective captcha just because you weren't able to read; they successfully shut out efforts of automatic recognition. Except they forgot to make an English version... Jun 29 at 6:13
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It shows ”ろく たす なな“. To obfuscate sentence, It use combination of HIRAGANA and KATAKANA.

6+7

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  • OK but what does the first line say? Jun 28 at 23:07
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    @ConsultingNewb it says "Solve the following arithmetic problem and submit your answer in half-width characters." Jun 29 at 7:47

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