I learned that for 4-SAT, if clause to variable ratio is more than 10, the generated problems become difficult to solve, and the likelihood of formula to be SAT or UNSAT is close to 50%. So I generated 3 types of formulas:
When he stole the show with the Spice Girls by showing off his breakdancing skills just before his third birthday, his mum declared him to be "the next Justin Timberlake".
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6Koch borrowed the idea of using gelatine from mycologist Oscar Brefeld, who had used it to grow fungi. Interestingly, Brefeld also employed carrageenan, another seaweed-derived jelly. Because fungi generally favor growing at ambient temperatures, Brefeld might have been less plagued by the melting of growth media than Koch.
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