event log

> 0   (accumulate (sequence (capture 1) (capture 1) (capture 1)))
> 1   (sequence (capture 1) (capture 1) (capture 1))
> 2   (capture 1)
> 3   1
  3 > 1
  2 > (capture 1)
> 4   (capture 1)
> 5   1
  5 > 1
  4 > (capture 1)
> 6   (capture 1)
> 7   1
  7 > 1
  6 > (capture 1)
  1 > (sequence (capture 1) (capture 1) (capture 1))
  0 > (accumulate (sequence (capture 1) (capture 1) (capture 1)))