Because the "unwritten rule" of "odd one out" type things is that all the other have a feature in common that the odd one out does not share. Not being the odd one out is not a sufficient common feature..... e.g. "they are not compound words" "they are not edible". Weak. You might as well argue that stupid is clearly the odd one out because it's the only word that begins with s.
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The most difficult thing is the decision to act, the rest is merely tenacity Amelia Earhart
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