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7dcbe6a983
The regexes to detect the optional prefixes at the start of some interaction types are constructed to optionally match the prefix, so we need to ensure that the matched group is really there when trying to strip it from the given value in CRCheckValueNodes. also remove "check for prefix" from CRcheckValueNodes prefixes on correct responses patterns are removed in the section above by CRremovePrefixes, so this block was redundant. The `.pre` property for each correct_response is not used anywhere else, so this removes their definitions too.