# harmonious coloring

> proper vertex coloring in which every pair of colors appears on at most one pair of adjacent vertices

**Wikidata**: [Q5659354](https://www.wikidata.org/wiki/Q5659354)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Harmonious_coloring)  
**Source**: https://4ort.xyz/entity/harmonious-coloring