The Exultet can also work well if divided equally between two singers, one clergy and one lay.
The tricycle rule: nothing prohibits the use of a tricycle by the celebrant for all of Mass, but he shouldn't. I'd add that other rules discourage it implicitly, but people need explicit rules, apparently.Of course, there are lots of things not forbidden by rubric that it is still not a good idea to do (such as the celebrant wearing a clown nose or standing on his head).
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