This mistake could be made more "eyesoreous" and possibly avoided by naming the begin/end times b1, b2, e1, e2 instead of opaque letters. I would fire the OP fo

This mistake could be made more "eyesoreous" and possibly avoided by naming the begin/end times b1, b2, e1, e2 instead of opaque letters. I would fire the OP for that alone :p