Fast set indexing data structure for superset retrieval

I am given a set of sets:

fast n-gram access data structure

TL;DR

fast n-gram access data structure

TL;DR

fast n-gram access data structure

TL;DR

fast n-gram access data structure

TL;DR

Data structure for traversing hierarchical hostnames

So, quite often I’ll come across a situation where I’d like to process hostnames in a hierarchical manner.

Data structure for traversing hierarchical hostnames

So, quite often I’ll come across a situation where I’d like to process hostnames in a hierarchical manner.

Finding common prefixes for a set of strings

I am trying to find common prefixes for a sorted set of strings. i.e. if the following strings are given:

Best Data structure for implementation of dependent drop-downs

I want to implement dependent drop-down feature on a web page in my website containing the following drop-downs:

Best Data structure for implementation of dependent drop-downs

I want to implement dependent drop-down feature on a web page in my website containing the following drop-downs: