 also that any event that has a mental component is also an
            instance of this collection, so that events like preparing
            lunch would be classified as instances of <a
            href="./perception-vocab.html#AtLeastPartiallyMentalEvent">#$AtLeastPartiallyMentalEvent.</a>
            In entering knowledge, it is almost always possible and
            preferable to use one of the specializations of <a
            href="./perception-vocab.html#AtLeastPartiallyMentalEvent">#$AtLeastPartial