Three colors are not, in general, sufficient to guarantee this.The largest planar complete graph has four vertices.
On the seven-segment displays of pocket calculators and digital watches, as well as certain optical character recognition fonts, 4 is seen with an open top.
4 is also the only square one more than a prime number.
A number is a multiple of 4 if its last two digits are a multiple of 4.
Ali's showers are now only 25-minutes and do not involve any painful rituals.
She continues to work to conquer her remaining OCD issues and anticipates, in time, a full recovery from the OCD which has plagued her since the age of four.
-- Lisa, North Carolina Click on the graphic below to learn about Alexanda's story on You Tube: Alexandra wants nothing more than to lead a revolution against this insidious, debilitating monster we call OCD!