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oileanachstudentmasculine noun
the
an t-oileanach
after a preposition
an oileanach
of the
an oileanaich
plural
oileanaich
the (plural)
na h-oileanaich

Every form but the headword, the genitive and the plural is worked out by the spelling rules in the grammar guide, so what you see here is what the guide teaches. Awaiting a fluent speaker’s review.