I desired to do this for my own satisfaction, and I had little hope that other people would be interested in this work, especially since it was primarily linguistic in inspiration and was begun in order to provide the necessary background of ’history’ for Elvish tongues.
There are no more uses of "primarily" in the book.
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Did the author mention multiple companies primarily to demonstrate diversity of solutions or to show that interest in the industry is widespread?
The second paragraph is primarily concerned with showing how the colleges are different.