root/pypi: links for democritus-math

root/pypi democritus_math-2021.1.2801.tar.gz
root/pypi democritus_math-2021.1.2501.tar.gz
root/pypi democritus_math-2021.1.2101.tar.gz
root/pypi democritus_math-2021.1.28.101.tar.gz