:- :- :- :- :- :-
KaTeX:\bra{\phi} \bra{\phi} KaTeX:\ket{\psi} \ket{\psi} KaTeX:\braket{\phi|\psi} \braket{\phi|\psi}
KaTeX:\Bra{\phi} \Bra{\phi} KaTeX:\Ket{\psi} \Ket{\psi} KaTeX:\Braket{ ϕ | \frac{∂^2}{∂ t^2} | ψ } \Braket{ ϕ | \frac{∂^2}{∂ t^2} | ψ }
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