It says safek chashecha and safek eino chashecha, asks the Tosfas Chadashim on the mishnayus, isn’t it obvious from safek chashecha that it is a safek because of safek eino chashecha? He gives a brilliant answer. Safek chashecha is erev shabbos and safek eino chashecha is motzei shabbos where for each one we are concerned not to violate shabbos.
