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(librep.info)Type Predicates

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Type Predicates
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   Each type has a corresponding predicate which defines the objects
which are members of that type. Each predicate function has a single
parameter, if that parameter is of the correct type it returns true.

`integerp', `numberp', `null', `consp', `listp', `vectorp', `subrp',
`functionp', `sequencep', `stringp', `symbolp', `processp', `filep'.

   The documentation for these functions is with the documentation for
the relevant type.