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The original proof of the genus of the complete graphs $K_n$ depended onMayer's \emph{ad hoc} solutions for $n = 18, 20, 23$. Recently, an improvedsolution for $K_{20}$ was found by the author. The purpose of this note is touse the theory of current graphs to interpret the aforementioned result and toprovide new embeddings of $K_{18}$ and $K_{23}$.

Revisiting Mayer: Symmetric solutions for sporadic cases of the Map Color Theorem