An unsatisfiable formula is:
Sign up for our Future Earth newsletter to keep up with the latest climate and environment stories with the BBC's Justin Rowlatt. Outside the UK? Sign up to our international newsletter here.
，这一点在91视频中也有详细论述
Фото: IMAGO/Lauri Heino / Global Look Press
It's absurd, niche, and deeply online.
Wordle-obsessed? These are the best word games to play IRL.