But Mr Duffield will be keen to show that Oracle is not invincible.

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The market may be inefficient, but it remains close to invincible.

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"He was known as a warrior, the invincible patriarch who could be depended on to play through his injuries, " the suit said.

CNN: January 23, 2013 -- Updated 2220 GMT (0620 HKT)

"They historically have been the least-insured age group in the U.S., most physicians are less suspicious of cancer in healthy young adults, and many of these patients -- once diagnosed -- may still feel invincible and be in denial, leading to less compliance with their treatments, " he said.

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You could be invincible, unlock all weapons or give everyone giant heads if you really wanted to.

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