['it', 'join', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'mix-22.1-2-1', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
It is joined by a second, and then a third.
<PRP> is joined by <DURATION>0 second, and then <DURATION>0 <ORDINAL>0.