brain-even
https://asciinema.org/a/8uaP7bNtfXj1WhSrBJreHQ2j0
brain-calc
https://asciinema.org/a/UFMbsh6Hw90gST28CIamkGyjU
brain-gcd
https://asciinema.org/a/dNir4IHhW13oQvZPahecgUcPc
brain-progression
https://asciinema.org/a/PHhzsqBNGI3dRUBQBuVv7pSIf