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Andreas Lauser authored
counter-intuitively, ostringstream::clear() does not reset the string it writes to. that can be done using ostringstream::str("") git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@7331 2fb0f335-1f38-0410-981e-8018bf24f1b0
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