Linter:
Video of working process brain-even: https://asciinema.org/a/dZv4OT4skrs16ZMNFTcLA7Tcq
Video of working process brain-calc: https://asciinema.org/a/vCsFhKtJ4uEMbAMYSDWDy7jRL
Video of working process brain-gcd: https://asciinema.org/a/t0x3s6tqsV6bcpN5D9fI6BznG
Video of working process brain-progression: https://asciinema.org/a/ILhj3JjrgWvyaomHHBT6CVD9f
Video of working process brain-prime: https://asciinema.org/a/ZtRGvTPhFxjtsA4oBttpIyOee