Next, let's rewrite the `dunk` command as well:

      (game-action dunk bucket well garden
        (cond (chain-welded (setq bucket-filled 't)
                            '(the bucket is now full of water))
              (t '(the water level is too low to reach -))))

Notice how the `weld` command had to check whether we have the subject, but that the `dunk` command skips that step. Our new `game-action` SPEL makes the code easy to write and understand.
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