it looks like he filled in the wrong answer, could there be another answer to the question, one that make all the words linked to it make sense, cause when you fill in giglamesh, no of the words around it make sense.

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\"We\'re not alone on this Island and we all KNOW IT\" - John Locke

Locke: Why do you find it so hard to believe?
Jack: Why do you find it so easy?
Locke: It\'s never been easy.