Answer :

TSO
P- Parenthesis
E- Exponents
M- Multiplication
D- Division
A- Addition
S - Subtraction
P ⇔ Parenthesis 
E ⇔ Exponents
M ⇔ Multiplication.
D ⇔ Division.
A ⇔ Addition.
S ⇔ Subtraction.

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