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\title{\vspace{-2cm}
\leftline{\chudam East-West J. of Mathematics: Vol. 22, No 2 {\thuong
(2020) pp. \pageref{firstpage}-\pageref{lastpage}}\hfill}
\vspace{-0.2cm}\leftline{\thuong   https://doi.org/10.36853/ewjm.2020.22.02/??\hfill}
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 {\chuto 
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{\bf Key
words:}   
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2010 AMS Mathematics Classification:  
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