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Spectral data recorded during the degradation experiments were arranged in eleven data subsets, seven matrices D pHi of size 144 181 i 1, 3, 5, 7, 9, 10, 12 from acid base degradation experiments, three matrices D oxj 144 181; j 2, 7, 12 from oxidative degradation, and the matrix D О» 72 181 from the photodegradation experiment <a href=https://sildenafi.cfd>natural alternative to viagra</a>
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