Origin of four-color problem
Words nearby four-color problem
How to use four-color problem in a sentence
Several times, either because they forgot or they had a technical problem, they connected directly, and we could see them.
There are four photos there of representative presidential candidates.
Four weeks after the injections, all 20 of the participants had developed the antibodies needed to stave off the infection.
Every once in a while, they act swiftly and acknowledge the problem.
Even other men of color considered Revels a curious figure, for Mississippi had never had a large free black population.The Black Man Who Replaced Jefferson Davis in the Senate|Philip Dray|January 7, 2015|DAILY BEAST
A little boy of four was moved to passionate grief at the sight of a dead dog taken from a pond.Children's Ways|James Sully
The pink flowers are the largest while those of a yellow color are the smallest.
In cross-section the burrows varied from round (three inches in diameter) to oval (three inches high and four inches wide).Summer Birds From the Yucatan Peninsula|Erwin E. Klaas
Before the spinet a bench was placed about four feet below the keys, and I was put upon the bench.Gulliver's Travels|Jonathan Swift
We had six field-pieces, but we only took four, harnessed wit twice the usual number of horses.