Reference for Keritot 53:22

ת"ש

If so, is not this identical with the previous case? - In the firs case he bought it for four [zuz] and improved it with four [zuz] more, so that [in fact] it cost him [in all] ei [zuz]; in the second case he bought the ram for four [zuz] and improved it with three [zuz] more and now it is worth eight [zuz].

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