(comparative more crackproof, superlative most crackproof)
crack + -proof
"crackproof." YourDictionary, n.d. Web. 11 October 2018. <http://www.yourdictionary.com/crackproof>.
crackproof. (n.d.). Retrieved October 11th, 2018, from http://www.yourdictionary.com/crackproof
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