${\displaystyle {\ce {\mathsf {[R-{\overset {\oplus }{N}}{\equiv }{\overset {\ominus }{C}}{:}<->R-{\ddot {N}}=C{:}]}}}}$

<ce>[R-\overset{\oplus}N{\equiv}\overset{\ominus}C{:} <-> R-\ddot{N}=C{:}]</ce>

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