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Identification of poisonous and non-poisonous snakes is commonly done with the help of a diagrammatic or dichotomous key based on external morphological characters. The first distinguishing feature is the presence or absence of venom apparatus. Snakes possessing a pair of hollow or grooved poison fangs connected to venom glands are poisonous, whereas snakes lacking such specialized fangs are non-poisonous. In a diagrammatic key, the next character considered is __________ _________ _____ __________ _________.
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