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  1. or download this
    input:
    <it>a</it>+2<it>b</it><inf><it>cd</it></inf>
    ...
    output:
    <it>a</it>+2<it>b<inf>cd</inf></it>
    <it>a</it>+2<it>b<sup>cd</sup></it>
    
  2. or download this
    s!</it><inf><it>(.*?)</it></inf>!<inf>$1</inf></it>!g;
    s!</it><sup><it>(.*?)</it></sup>!<sup>$1</sup></it>!g;
    
  3. or download this
    s!</it><(.*?)><it>(.*?)</it></$1>!<$1>$2</$1></it>!g;