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References to 'order of operations'
1. arithmetic by PrimeFan
2. context-free language by CWoo
3. Dyck language by CWoo
4. example of G\"odel numbering by Henry
5. expression by Wkbj79
6. Friedman number by aplant
7. Google calculator by CompositeFan
8. infix notation by akrowne
9. logical language by Henry
10. Polish notation by PrimeFan
11. reverse Polish notation by Mravinci