ϡ ߡ ɡ science. 16 20 . ɡ . 1 ɡ . - - - - - - - ɡ ǡ ɡ ǡ . ȡ ʡ ϡ . ޡ ʡ . ɡ ɡ ɡ ֡ ߡ . - - - - - - - ͡ ɡ ǡ .

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hgk,l tn yvtm fhv]m Hl ]htzm>> Hdilh Htqg gwpj;?