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To date , several studies have demonstrated that conventional water treatment processes are ineffective for removal of most EDCs and in some instances produce multiple unknown transformation products . But Evian last year was a disappointment and the Russians in 2006 are an unknown force . The effect of creatinine clearance less than 35 mL / min on enfuvirtide clearance is unknown . List as " unknown " if no format information is available . If God is unknown to them , it is not because He could not have been known ( at least insofar as nature reveals Him — compare Psalm 19:1 -6 ) , but because they were ignorant and didn ’ t want to know Him . The effect on human fertility is unknown . The time to reach 50 % of initial ulcer area was estimated although it is unknown how this relates to complete ulcer healing . What greatness had not floated on the ebb of that river into the mystery of an unknown earth ! The exact cause of choriocarcinoma is unknown . This is equivalent to solving the equation X ( t ) = A S ( t ) , where A is an unknown mixing matrix and S ( t ) is an unknown time dependent vector whose elements are independent .