Make it work again, refactor to add methods to BNF Grammar like is_normal_form -> True/False or to_normal_form
And test test test
---
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Make it work again, refactor to add methods to BNF Grammar like is_normal_form -> True/False or to_normal_form
And test test test
--- Want to back this issue? **[Post a bounty on it!](https://www.bountysource.com/issues/883537-restore-fix-refactor-and-test-chomsky-normal-form-code?utm_campaign=plugin&utm_content=tracker%2F129089&utm_medium=issues&utm_source=github)** We accept bounties via [Bountysource](https://www.bountysource.com/?utm_campaign=plugin&utm_content=tracker%2F129089&utm_medium=issues&utm_source=github).