Please
    Excuse
        My Dear
            Aunt Sally





Please

    Parentheses
   
(or other grouping symbols)





Excuse

    Exponents
   
(powers or roots)





My Dear

    Multiply or Divide
   
(from left to right)





Aunt Sally

    Add or Subtract
   
(from left to right)





Parentheses
    Exponents
        Multiply or Divide
            Add or Subtract





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