> *This is NOT ok:*
> JxKet('1/2','1/2').dual*JzKet('1/2','1/2') ==> ⟨1/2,-1/2❘z:1/2,-1/2⟩ # The
> x is lost, the output is not clear.
>
> What should be done?
.dual returns the J?Bra classes. You didn't define
_direction_string_label for these classes.
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