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     8 years ago 

    welcome to the club Dr Noor. Please vote for the content. left to where you can see 'votes' under the content there is a circle with (^) in it. push it. thx. and by the way 2 is wrong but 4 is correct ;)

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     8 years ago 

    Perfect

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     8 years ago 

    glad to see you here doc. Much better than the facebook. Here I feel professional ;)