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\<bookmark_value\>tbillyield function\</bookmark_value\>\<bookmark_value\>treasury bills;rates of return\</bookmark_value\>\<bookmark_value\>rates of return of treasury bills\</bookmark_value\>
\<bookmark_value\>tbillyield 함수\</bookmark_value\>\<bookmark_value\>국채; 수익률\</bookmark_value\>\<bookmark_value\>국채 수익률\</bookmark_value\>
