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Bracketed pairs/lists appear throughout the generated HUTN grammars. They consist of 0 or more (strictly 2 for a pair) values
separated by white space or commas, surrounded by matching brackets. The brackets can be either square [], round (), or angle
<>.
As a number of the representations that use bracketed pairs/lists are recursively defined, it is to be expected that bracketed
pairs/lists will be nested. The use of different kinds of brackets may help to make the groupings clearer in the text when
there is extensive nesting.
Bracketed form is also used for parametric form, but in this case the brackets are
always round, and there is at least one value in the list (See 6.3, “Class
Representations?).