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福建—宁夏，结下的“山海情”历久弥新。
New Moon - The Moon is between Earth and the sun, so the side we see is dark (in other words, it's invisible to the eye).
For SAT problems with 10 variables and 200 clauses, it usually output SAT as expected, but the assignment was never valid (Examples: first, second). Once it claimed a SAT formula was UNSAT. For this reason I didn't bother testing with more variables for the SAT case.