How are snakes classified?

I invite you to follow the link : http://www.guyane-guide.com/dossiers/classification%20serpents.htm to know how snakes are scientifically classified. They are classified by the existence and the position of the fang (crochet à venin) in the mouth. There are four groups of snakes:
- First, snakes without any fangs : they don't bite! ex: boa constrictor (but...not so friendly!), grass snake (couleuvre).
- The three other groups are classified by the position of the fang in the mouth. The further the fang is in the back of the mouth, the more dangerous the bite of the snake is.
Just a little question : Could you tell me to which group snakes belong?

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