https://adventofcode.com/2022/day/4

>>> :{
:main +
   "2-4,6-8\n\
   \2-3,4-5\n\
   \5-7,7-9\n\
   \2-8,3-7\n\
   \6-6,4-6\n\
   \2-6,4-8\n"
:}
2
4