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The very idea that it might lose its status as the world's reserve currency has been unthinkable.

All of this was unthinkable under Assad, as Syrians could never protest freely for fear of reprisals.

Five days after George's death, Rhian faced the unthinkable when her husband Paul took his own life.

Thank you for doing the unthinkable to a team desperate for the impossible.

But there is gathering momentum around nationalisation as the solution, in a way unthinkable not so long ago.