essfully perform an instance of some kind of action
            (ACT-TYPE), then one must be capable of performing instances
            of another kind of action (OTHER-TYPE) with the performance
            attribute PERF-ATT at a level of at least LEVEL. For
            example, <a
            href="./doing-vocab.html#skillRequired">(#$skillRequired</a>
            PlayingVolleyball ServingAVolleyball #$Competence #$Low). If
            you can't even serve a volleyball at a `Low' competence
            