Sentence Correction (SC) | Re: Air traffic routes over the North Pole are currently used by only two

Air traffic routes over the North Pole are currently used by only two or three planes a day, but it was found by a joint Canadian–Russian study to be both feasible as well as desirable if those routes are opened to thousands more commercial planes a year.

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S find O to be OC
I find the book interesting.
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Russian study has found opening those routes to thousands more commercial planes a year to be both feasible and desirable. (E)
Russian study has found if those routes
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