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A dynamic procedure is used to keep track of conflict clauses added during the search. An important observation is that locality is achieved by exploiting recently learned information. This helps to speed up the search. An example is the Variable State Independent Decaying Sum (VSIDS) strategy employed in [82]. Basically, this strategy attempts to satisfy recently learned conflict clauses. A counter exists for each literal to count the number of occurrences in clauses. Each time a conflict clause is added, the appropriate counters are incremented.

E. a PDF test pattern. A detailed description of the basic SAT concepts is given in Chapter 3. The first SAT-based approach for PDF test generation was proposed in [17] where a seven-valued logic is used to generate robust tests for PDFs in combinational circuits. For the transformation into a Boolean SAT problem, a Boolean encoding is applied. In [61], Incremental SAT [55, 92] is used to speed up non-robust PDF test generation. Similar to [41], paths are incrementally sensitized causing a large number of untestable path delay faults to be pruned in a single step.

The backtrack limit was set to 10. 1. The first column gives the name of the benchmark. Then, the run time is given in CPU seconds for each approach. Run times for Atalanta with and without fault simulation are given in Columns Fs and No fs, respectively. 1 Atalanta returned no results, when fault simulation was disabled. For TEGUS and PASSAT, the run time to generate the SAT instance and the time for SAT-solving are separately given in Columns Eqn and SAT, respectively. Both SAT approaches are significantly faster than the classical FANbased algorithm and solve all benchmarks in nearly no time.

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A Simple Method for Determining the Colors of the Stars (1916)(en)(5s) by Seares F.H.

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