6 Ways: Unique List of items from Multiple entries

Objective

You have some data where a particular field has many items occurring repeatedly and you need a list of unique items only like from (A,B,A,C,D,E,F,F,E,C,B,A,D) you need (A,B,C,D,E)

Key Advanced Skill: Creating List from scattered entries by Avoiding/Ignoring/Skipping empty rows

Objective

You are working on a data set and want to get your results based upon certain criteria.  Now the problem is your result contains blank rows / rows which do not qualify with your criteria. You want result as a list i.e. without blank rows. 

This model/method resolve many data picking/filtration issues,therefore in my opinion its a KEY concept.