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Edited sentence: In Rolls-Royce's view, Britain had forfeited its chances with the Tudor, Hermes, Comet, and Britannia, and its further attempts to enter the sector put engine making, the only viable and lucrative part of Britain's civil aviation sector, at risk of alienating its American clients.In the next two decades, Rolls-Royce courted US airliner makers and lobbied for the complete cessation of British airliner production, which was providing minor but irritating competition to the Americans