53– 131 –https://www.retio.or.jp/attach/archive/82-118.pdfhttps://www.mlit.go.jp/report/press/content/001426603.pdf2021https://www.mlit.go.jp/tochi_fudousan_kensetsugyo/const/content/001405335.pdfhttps://www.mlit.go.jp/tochi_fudousan_kensetsugyo/const/content/001405335.pdfSNS5030301030501020215023108
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