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URL：https://1.bp.blogspot.com/-q3cjaDiPyaQ/X8OC7xbAmRI/AAAAAAAAJhU/AguppkT0t14HaGbScRHY-EUl5YgXPC2JwCLcBGAsYHQ/s1414/big-printable-alphabet-letter-r.png 掲載元：https://www.englishforkidz.com/2020/11/letter-r-worksheets-flashcards-coloring.html.html
