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The company’s strategy has left some rivals scratching their heads.

"In this case, scratching of the upper paint layers can have a significant impact on the viewing experience of the piece," Ms McAloone said.

He recalls there being a lot of "head scratching" among surgeons, because the condition was so rare.

At every turn, until Monday, USC found an answer for her absence, scratching and clawing their way through two tournament rounds.

"It is one of those cases where you keep scratching and you keep finding," he adds.