\int_{\partial A} f = 0
grow
shrink
fade-out
fade-up (also down, left and right!)
visible only once
blue only once
highlight-red
highlight-green
highlight-blue
#! /usr/bin/env python3
# -*- coding: utf-8 -*-
import sys
import logging
if sys.version_info < (3, 2):
raise Exception("This program must use python 3.2 or greater")
if __name__ == "__main__":
main()