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diff --git a/article.tex b/article.tex
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@@ -106,7 +106,7 @@ network lifetime and improve the coverage performance.
 \end{abstract}
 
 \begin{keyword}
-Wireless   Sensor   Networks,   Area   Coverage,   Network   lifetime,
+Wireless   Sensor   Networks,   Area   Coverage,   Network   Lifetime,
 Optimization, Scheduling, Distributed Computation.
 
 \end{keyword}