Who composed the Piyut Echad Mi Yodeya that is commonly recited on Pesach?
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8Not Isaac Moses :) – Shmuel Feb 16 '12 at 20:51
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1Related: judaism.stackexchange.com/questions/857 – msh210♦ Feb 16 '12 at 21:04
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See my answer here – b a Feb 17 '13 at 6:35