If I told you there was something on the left side of your car... You might ask "My left or yours?".
Every now and then we read about people who've had operations done on the wrong side of their body. If you do a simple web search for "surgeon operated on wrong side", you'll get countless results because the doctor's often don't make it clear which side they're referring to.
For example:
CNN-Patients, beware of wrong-side surgeriesQuote:
According to a 2006 study looking at the frequency of surgical errors in the United States, each year there could be as many as 2,700 mistakes where a surgery is performed on the wrong body part or the wrong patient. That's about seven per day.
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Continue...Why We Need More Non-Ambiguous Terms For Left and Right...