Sketched out concepts, using Excalidraw[2]
Hard difficulty hints, answers for March 8 PipsLess Than (2): Everything in this space must be greater than 2. The answer is 1-6, placed vertically.
，更多细节参见新收录的资料
10.1.3. pg_basebackup
Single dose of potent psychedelic drug could help treat depression, trial shows