各营收区间的研发强度则呈“金字塔”式负相关，即研发强度的最高值和中位数都随着营收规模的增长而递减。金字塔尖是那些营收万亿元级的巨无霸企业，它们的研发强度最高值和中位数分别仅为3.27%和2.08%；而金字塔底则是营收十万元级及以下的初创小公司，它们的研发强度中位数竟高达37446.12%，最高值甚至突破47441%。
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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: