event log
> 0   (cmt (sequence (capture "a") (capture "b")) "<function 0x5597D8DFE5C0>")
> 1   (sequence (capture "a") (capture "b"))
> 2   (capture "a")
> 3   "a"
  3 > "a"
  2 > (capture "a")
> 4   (capture "b")
> 5   "b"
  5 > "b"
  4 > (capture "b")
  1 > (sequence (capture "a") (capture "b"))
  0 > (cmt (sequence (capture "a") (capture "b")) "<function 0x5597D8DFE5C0>")