Software developers can't test everything, but they can use combinatorial test design to identify the minimum number of tests needed to get the coverage they want. Combinatorial test design enables users to get greater test coverage with fewer tests. Whether they are looking for speed or test depth, they can use combinatorial test design methods to build structured variation into their test cases. Note that "coverage", as used here, is referring to combinatorial coverage, not requirements coverage.
Try to answer this question if possible (otherwise reply "unanswerable"): Although software developers are unable to test everything, what do they run to keep the testing to a minimum?
use combinatorial test design