G. Nouns can be singular or plural. Singular means "one.We'll investigate how to take random samples with replacement. That is, if an observation is selected once, it does not prevent it from being selected again. I want to get 4 random letters from it, but including repetition. Running this will only give me 4 unique letters, but never any repeating letters. Change the last letter: 1. This leaflet explains how inserting an inflatable balloon can be used to treat women with a Bartholin's cyst or abscess.