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1.62.6 Dictionary: dictionary testing

includes: anObject
Answer whether the receiver contains anObject as one of its values


includesAssociation: anAssociation
Answer whether the receiver contains the key which is anAssociation's key and its value is anAssociation's value


includesKey: key
Answer whether the receiver contains the given key


occurrencesOf: aValue
Answer whether the number of occurrences of aValue as one of the receiver's values