- brain-even: https://asciinema.org/a/LNPalJ73b3a9AAzMtyp1EmQb5
- brain-calc: https://asciinema.org/a/nzKM27y2lxgn8biKXXmi1TUTj
- brain-gcd: https://asciinema.org/a/q3iGUshUYckn3mwXnsteZ8gy5
- brain-progression: https://asciinema.org/a/f2k8ndaWzwUORMFdCDfBlilhZ
- brain-prime: https://asciinema.org/a/7SSjEvCf7t8pwH4pMLSx7pQht