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azo group

n.
1.the bivalent group -N=N- united to two hydrocarbon groups

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    Idiom of the Day

    needle in a haystack
    something that is very hard to find
    Looking for the lost receipt among the other receipts was like looking for a needle in a haystack.



    1.
    Choose an idiom to replace the expression in the brackets:
    There were (almost) three hundred people at the wedding.

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