Various Examples of Where We Have the Problem of דבר דבר (Dabair Davar) and ממצוא חפציך (Mimtzo Cheftzecha);
Understanding the problem with making items float in water on Shabbos;
ממצוא חפציך (Mimtzo Cheftzecha): What Type of Instances Would Make These Actions Allowed to Be Done on Shabbos?;