[ししょくていり;よんしょくていり, shishokuteiri ; yonshokuteiri](n) four-color theorem (colour) (theorem stating that any map can be colored such that no two adjacent segments have the same color, if only four colors are used)[Add to Longdo]
[いろわけ, irowake](n, vs) classification; color coding; colour coding; color keying; colour keying; differentiation using different colors (colours)[Add to Longdo]