Student: Do we have to memorize that big equation?
Elkamel: No. this one?
Student: The one above it.
Elkamel: Oh, they are the same equation.
Everyone: ???
Student: Do we have to memorize that big equation?
Elkamel: No. this one?
Student: The one above it.
Elkamel: Oh, they are the same equation.
Everyone: ???