0-\operatorname{i}\,e^{00}-\operatorname{i}\,e^{00}-e^{0000} \right\rangle \;, \\[0pt]  U^0_\omega    &=& \left\langle e^{0}-\operatorname{i}\,e^{000},\; e^{0}+\operatorname{i}\,e^{000},\; e^{0}+\operatorname{i}\,e^{000},\; e^{0}-\operatorname{i}\,e^{000} \right\rangle \;, \\[0pt]  U^0_\omega    &=& \left\langle e^{0