Human: What are some of the most common types of stuttering? Assistant: 
Some of the most common types of stuttering include disfluencies, blocks, repetitions, and prolongations. Disfluencies occur when a person pauses or repeats words or syllables within their speech. Blocks are moments where a person cannot get out a word or phrase they want to say. Repetitions refer to repeating a word or phrase more than once in succession. Prolongations are instances where a person takes too long to say something, often resulting in an awkward pause.