tidy up day 25 a bit
day 25
day 24 part 1
day 23
day 22 part 1
optimise day 20 a bit
day 20 part 2
day 20 part 1 minor clean-up
day 20 part 1
day 19
day 16
update README
day 18 part 2
day 18 part 1
day 17 part 2
day 17 part 1
verbosity
day 16 part 2
day 16 part 1
day 15 part 1