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U is a special link used with nouns. In most cases,
nouns have both a determiner requirement ("D-") and a main
subject-object requirement ("S+ or O- or J-"). In a few
cases, however, a single word appears to satisfy both
What kind_of dog did you buy
"Dog" would seem to be acting like the prepositional object of
"of" here; but, unusually, it requires no determiner.
Therefore we give nouns a "U-" connector, disjoined with both
its "D-" and its "S+ or O- or J-..." complex.
Other uses include the following:
We spend four dollars per student
We spend four dollars a student
For the latter case, we give the word "a" the expression
"[[Mp- or Us+]]". Since this usage is rare compared to
the other uses of "a", we give it a cost of 2.
U#c is used in comparatives; see "MV: Comparatives IV".
Grammar Documentation Page.