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" The poster was not included in the record on appeal , so it is impossible to examine it . What if the version number is wrong or ( worse ) if the Request message does n't pass the " well formed " or " valid " checks ? Val / val cases should precede val / met yet the time scale for the former is impossible to predict . For anything other than trivial cases it is impossible to test exhaustively or replicate test conditions perfectly , so no matter how comprehensive the test in its scope , it cannot be conclusive . Such a revision is long overdue and needs to be carried out as soon as it becomes feasible . There are some cases , however , in which , as the quality under consideration has no name , it is impossible that those possessed of it should have a name that is derivative . nvCJD thus remains flat with no explanation for the victim set and no clues except met / met and relative youth . In the case of ' positives ' and ' privatives ' , however , change in both directions is impossible . Until safe and effective vaginal microbicides are developed , the Centers for Disease Control and Prevention ( CDC ) recommends consistent and correct use of male latex condoms , with or without the use of a spermicide , to prevent sexual transmission of HIV and other STDs in high-risk populations .