One difficulty encountered when dealing with the tented arch pattern is that there is no single definition of just what one looks like. Another problem concerns the pattern's extent of upthrust; an upthrusting ridge does not have to rise to any particular height in order to form a tented arch pattern. Any fingerprint pattern that has at least two of the three basic requirements of a good loop pattern (sufficient recurve, delta, and ridge count across a looping ridge) is classified as a tented arch. When two independent ridges come together and form an angle, the resulting pattern may be called a tented arch. The arbitrary tented arch pattern is characterized by the presence of two equally good loops but only one delta formation.