Orach Chaim 2 - Batlah Daato - Personal intent is irrelevant if it differs from normal human intent
Orach Chaim 18 - Piyyutim [Extra poems in the service]
Orach Chaim 20 - Praying by a Grave
Orach Chaim 35 - The sanctity of the Ezrat Nashim [Women's Area] in the Beit haMikdash, Separation between men and women in prayer
Orach Chaim 39 - The "Heter Iska" converting loans into investments
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