Alice walks through the forest of forgetfulness and finds a lion and a unicorn. They have some strange habits. The lion lies on Mondays, Tuesdays and Wednesdays, but tells the truth during the other days of the week. The unicorn lies on Thursdays, Fridays and Saturdays, but tells the truth during on the other four days. The lion tells Alice, "Yesterday, I was lying." The unicorn added, "So was I." On what day were these things said?