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안쪽의 사각형은 그라데이션 없는 단색

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존재할 수 없는 계단


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두 선의 길이는 같음

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두 주황색 원의 크기는 같음

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존재할 수 없는 도형


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나선의 굵기는 끝까지 동일함

viewimage.php?id=3eb4de21e9d73ab360b8dab04785736f&no=24b0d769e1d32ca73dec8ffa11d02831046ced35d9c2bd23e7054f3c2e8467a8ea038db168b0e702a459e6a2c2cef8cf293dd473832e799c69023b3fca4a3f410c0ecb098781914eed07325084b55427a62d905c264a48d6dd7682dd5f732f60315b6fbff15e8e8da4bb60c2fa5acb18

두 사각형의 크기는 같음