Self reference is not supported when updating the value of variable, MS Flow

A quick one, consider the following scenario in

string a=”A”;
string b=”B”;

if i want string a to have “AB”, then the simple solution would be, a=a+b.

but in Flow self reference is not supported, surely MS is working to fix it.

A quick work around would be create another variable,

for example string c; and can do as c=a+b;

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