The phrase "necessarily exclusively" is correct and usable in written English.
You can use it in a sentence to express that something is absolutely required, and nothing else is sufficient. For example: "In order to understand the concept, you must read this book necessarily exclusively."
Suspected terrorists will be tried not before a jury but rather a commission made up primarily -- though not necessarily exclusively -- of military officers.
Because almost every Christian group believes that it holds the true faith (though not necessarily exclusively), the meaning of "orthodox" in a particular instance can be correctly determined only after examination of the context in which it appears.
While the company profiles aren't necessarily exclusively for a female audience, she says that the team built out the site's features based on the career tools and job search that women would look for.
A madrasah, though it can be, is not necessarily exclusively for religious studies; for example, a high school Muslim American student in the United States would refer to her public high school as a madrasah.
As Y561 is not exclusively selective for SRC, we cannot distinguish SRC substrates from those of other SFKs, and thus all peptides specifically detected in the CA-CSF-1R Y561F expressing cells are not necessarily exclusively SRC-regulated.
Acetylation of H3K64 appears to be performed largely, but not necessarily exclusively, by p300/CBP.
"I believe that the factors that are leaving children behind are not necessarily and exclusively financial factors," Dr. Paige said.
Did the £11,771 he spent on his second home in that four year period "wholly, necessarily and exclusively" enable him to carry out his parliamentary work?
When war comes, as it inevitably does, it is necessarily shown exclusively from the Jewish side: there is little room for doubt here that Arabs are the aggressors, and that Jewish nationhood after the brutalities of the pogroms and the Holocaust is the only way forward.
The cases in Table 2 do not necessarily belong exclusively to one category.
This does not necessarily or exclusively mean broadening the Sardinian dairy industry supply basket.
