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Combinatorial methods can reduce costs for software testing, and have significant applications in software engineering: Combinatorial or t-way testing is a proven method for more effective testing at lower cost. The key insight underlying its effectiveness resulted from a series of studies by NIST from 1999 to 2004. NIST research showed that most software bugs and failures are caused by one or two parameters, with progressively fewer by three or more, which means that combinatorial testing...