Statistics for Hidden Countries with a One-Letter Swap

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Sentence	Country	% Correct
There are a few differences between the tuba and sousaphone.	Cuba	97%
She was under the trance set by the hypnotist.	France	97%
Some consider black cats to be a bad omen.	Oman	91%
The chemical symbol for iron is Fe.	Iran	85%
My cousin and I went to the mall after soccer practice.	Mali	85%
Not every child enjoys playing outside, but most do.	Chile	82%
A baby born in September is either a Virgo or Libra, depending on the date.	Libya	82%
One perk of working from home is a more low-key dress code.	Peru	79%
A liquid stain is typically easy to remove if it is still wet.	Spain	79%
At the gym, I swim laps in the pool when he runs on the track.	Laos	64%