sentences:  In some cases, data reveals an obvious non-random pattern, as with so-called "runs in the data" (such as expecting random 0–9 but finding "4 3 2 1 0 4 3 2 1..." and rarely going above 4).If a selected set of data fails the tests, then parameters can be changed or other randomized data can be used which does pass the tests for randomness.The issue of randomness is an important philosophical and theoretical question.