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• s  based on sound reasoning or evidence

• With the high cost of human life in a high altitude scenario, holding mountain peaks was no longer tenable and forced the parties to come to the negotiating table.
• The Iranian strategy of playing both sides may not be tenable in the long-term, but for now it gives Iran influence in southern Iraq that must be the envy of both the Americans and .
• A more tenable theory: the rapidly multiplying fetal and infant cells may establish a general protection called ''tissue immunity.

• well-founded

News & Articles

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• Guest Post: Market Celebrates Egypt’s Coup, But It’s Not Over Yet
  Submitted by Jen Alic of OilPrice.com Market Celebrates Egypt’s Coup, But It’s Not Over Yet The situation in Egypt has not been tenable since the Muslim Brotherhood and President Mohamed Morsi took over, post-revolution, but now that the military has stepped in, ousted Morsi and placed him in detention, foreign investors are celebrating. No one knows what’s going to happen next, but the general ...
  July 5, 2013 - Zero Hedge

Quotes

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• Henry Paulson in Heritage.org (blog)
  In case anyone missed the subtle message, Paulson added, "We don't believe it is tenable to opt out, because doing so would leave you vulnerable and exposed."
• Liam Fox in International Herald Tribune
  If NATO is to exist and flourish in the future, this is not a tenable position,Fox told lawmakers during the session.