Commentary for Berakhot 88:2
מר זוטרא עביד כרב יצחק בר אבדימי ורב שימי בר אשי עביד כר' יצחק וסימנך חד כתרי ותרי כחד
Mar Zotra acted in accord with Rab Isaac b. Abdemi, and Rab Shimi b. Ashe in accord with R. Isaac. (A mnemonic for thee is : One in accord with two and two in accord with one.)
Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
M.: Hiyya.
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Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
I.e. the Rabbi with one part to his name (Zotra) acted in accord with the Rabbi who had two parts to his name (Isaac b. Abdemi).
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