i:1:"i/3.in"
m:+/*/'(2=#:')#(0^`I$","\*")"\)'"mul("\  / sum of product of valid (2-length) multiplications
m i                                      / part 1: valid multiplications
m@,/*'"don't()"\'"do()"\i                / part 2: cut out the parts between don't() and do()

~/aoc24k/3.html