The Chasam Sofer's Diyuk Between Pesach and Pesach Sheini
Rabbi Sruly Bornstein
The Chasam Sofer was able to be medayek the difference in the lashon between Pesach Rishon and Pesach Sheini about the halacha of how to eat the Matzah. Where the Torah puts the word על. Sugya: מרור