https://qooah.com/2012/07/20/%e5%93%88%e6%97%a5%e6%97%8f%e7%9a%84%e8%bc%b8%e5%85%a5%e6%b3%95%ef%bc%88part-2%ef%bc%89%e3%80%8ago-keyboard%e3%80%8b%e8%88%87%e3%80%8ajapanese-for-go-keyboard%e3%80%8b/