Reference for Keritot 33:5

אין ידיעה לחצי שיעור ואלא הדתניא פטור במאי מוקמת לה

But of which case speaks the statement that he is exempt; neither the one nor the other suits! - Rabbah may retort: Rabban Gamaliel follows R'Eliezer's opinion, who holds different Sabbaths are as different objects.<span class="x" onmousemove="('comment',' The version that he is exempt can now be explained as R. Hisda did.');">⁴</span>

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