R5RS, R6RS:
SRFI-87: Extends case to allow the following forms in clauses.
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Concept:CaseSensitivity Concept:DocumentationFormat Concept:ExtendedLambdaList Concept:FileSystem Concept:FindAndAnyInCollection Concept:ForeignInterface Concept:HashTable Concept:Module Concept:Networking Concept:ObjectSystem Concept:Process Concept:RegularExpression Concept:UserGroup
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