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煙管乗車;キセル乗車 | [キセルじょうしゃ, kiseru jousha] (n, vs) (See 煙管乗り) cheating on train fare by buying tickets covering only the first and last portions of the journey (so-called because traditional pipes had metal only in two short segments at the ends) [Add to Longdo] |
四色定理 | [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] |