Word Count : 113

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Let us show that the set $[a, \infty)$ is closed. A set is closed if its complement is _____ _________ _______ _________ ______ ________.
_________ _____ _________ ______ _________ _________ _______ _____ ____ __________ _____ ____.
___ ______ ______ ______ ____ ___ ___ _________ ___ ________.
____ _____ _________ ___ _______ ______ ________ __________ __________ ___ _____.
____ __________ __________ _____ _____ _______ ___ ____ __________ ____ _______.
_____ ____ ______ _______ _______ __________ _____ _______ ________ _______ _________.
_________ _________ ___ ________ __________ __________ _______ __________ ________ _____.
___ ______ _________ ________ ______ _______ ________ ___ ____ _______.
______ ______ ___ _________ ____ ___ __________ _________ ______ ______.
__________ __________ ____ ____.
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