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MID$ replaces a portion of a string variable with another string.
 
MID$(stringexpression$,start%[,length%])
    ■ If length% is omitted or if there are fewer than length% characters
      in the string (including the start character), the MID$ function
      returns all characters from the position start% to the end of
      the string.
    ■ If start% is greater than the number of characters in stringexpression$,
      MID$ returns a null string.
    ■ Use the LEN function to find the number of characters in
      stringexpression$.