[amibroker] Is there a hash table or dictionary structure accessible from AFL?

[Potato Soup]

I'm looking to check a value each bar to see if it exists in a pre-defined 
collection of values that I want to store before running the script. The 
collection is sufficiently large that it would benefit from being stored in a 
data structure with constant lookup time. Has anyone implemented this in AFL or 
through a plugin?