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This abstraction is applicable for lists in general and also for sets
specifically checking, whether a certain element is contained in the list
Checking for a member in a set: `memberp'
The difference between the abstraction `locate' and `memberp'
consists in the first argument being a condition for `memberp'
and not a predicate function.
`memberp' appears in this category because it is used by the abstraction
`create a union of two sets'.
Georg P. Loczewski