2013: save a character in problem 6
save some brackets in 2021 prob 7 solution
Minor improvements to 2014 solutions
Add a couple of minor cosmetic improvements
finish up last of the 2021 problems
add more solutions for 2021
save a whole character in 2017.prob6!
use •Repr instead of •Fmt for formatting numbers
more work on 2020 problems
solve one and a half more problems from 2020
Add more solutions for 2020
add remaining solutions for 2019
Create util.bqn and import it where used
Also shorten somewhat the definition of `letters`.
fix errors in 2018 problems 8 and 9
finish off 2018 and do a little golfing
add some solutions for 2018