TI is such a fun metric. You spend hours throwing arms down and making them do silly dances that seem to accomplish nothing, then suddenly there's a completed solve in front of you. At no point before this did it actually look like it would accomplish the puzzle. 

My immediate intuition for this puzzle, and the basis for this solution, was to pull apart half the molecule, then reset the other half to the start and pull it apart as well. I'd hoped this could be accomplished with 3 arms, but the more I worked on it there didn't seem to be an arrangement where arm 1 could help with the reset (it needs to swing by the input, and using a multi-arm would just result in trying to load arm 2 too fast), nor where arm 4 could help with outputting (geometry simply didn't allow it in any of my attempts), so a 4-arm solution was required. This is probably one of the slower TI solves too, since it operates at a rate of 18 (arms 1 and 4 don't play nicely at less than 6 period, and arm 2 simply can't do its job without 6 loops, giving 2 of each output every 36 cycles), but cycles is tertiary, so who cares. Cost I think I did fairly well on, as nearly every de-bonder here is used multiple times (some do as many as 4 debonds per snowflake). I'm not one to try to call out how well I'll place, but I have been known to cook on instructions solves in the past.