clickstream post_event_list data structure

Hi,

I was trying to match some events for clicks at a hit level for Cart Adds, and was unsure of why the numbers differed between the Ad-Hoc Tool and my aggregations.

I'm trying to understand the structure of that column a little bit better and was wondering if an event could be listed more than once per row?

I.e. 

(2,12,14,12) is listed out, so I would know that cart adds occured twice?

or is it structured as (2,12=2,14) which would be a different method of lookup?
 

Thanks,

Victor