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permanganic acid

n.
1.an unstable purple acid (HMnO4) known only in solution or of permanganate salts

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    Idiom of the Day

    like water off a duck's back
    without effect, without changing one`s feelings or opinion
    My boss always criticizes my friend but he ignores it and the criticism is like water off a duck`s back.



    1.
    She held the bag ________ even though her arm hurt ________.

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