Study Guide Shabbat 71 Today's shiur is dedicated in memory of Yosef ben Tzvi HaCohen z"l by Aviva and Benny Adler.  Can one combine an act where one forgot it was Shabbat and another where one forgot melachot were forbidden, and bring one sacrifice for both? There are varying opinions. If one cannot combine them and one needs to bring separate sacrifices, does that mean one cannot combine a half shiur of each to obligated one in sacrifices? Rabbi Yochanan and Reish Lakish disagree regarding one who ate two olive bulks of forbidden fats without realizing it was forbidden but with separate moments of realization of the sin - can one bring one sacrifice to cover both? There is a discussion regarding in what cases they disagree.