• Interaction With Composition. We have
    \[ \webleft (S_{1}\mathbin {\diamond }R_{1}\webright ) \cup \webleft (S_{2}\mathbin {\diamond }R_{2}\webright ) \mathrel {\smash {\overset {\scriptscriptstyle \mathrm{poss.}}\neq }}\webleft (S_{1}\cup S_{2}\webright ) \mathbin {\diamond }\webleft (R_{1}\cup R_{2}\webright ). \]

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