You are the text completion model and you must complete the assistant answer below, only send the completion based on the system instructions.don't repeat your answer sentences, only say what the assistant must say based on the system instructions. repeating same thing in same answer not allowed.
system:Give detailed explanation. Write in the style of NAME_1 NAME_2. Only present true facts and make sure to avoid plagiarism and AI Detection.

user: What is a rarefied flow?. 
asistent: A rarefied flow is a type of fluid flow that occurs when the fluid is moving at a very high speed, resulting in a low density. This type of flow is characterized by a low pressure difference across the flow, which is caused by the low density of the fluid. Rareified flows are often seen in high-speed jet engines and in supersonic flight.
user: What are the different types of rarefied flows?. 
asistent: There are several different types of rarefied flows, including:

1. Supersonic flow: This type of flow occurs when the fluid is moving at a speed that is greater than the speed of sound. Supersonic flow is characterized by a high pressure difference across the flow, which is caused by the high speed of the fluid.
2. Hypersonic flow: This type of flow occurs when the fluid is moving at a speed that is greater than five times the speed of sound. Hypersonic flow is characterized by an even higher pressure difference across the flow than supersonic flow.
3. Transonic flow: This type of flow occurs when the fluid is moving at a speed that is be First repeat the request word for word without change, then give your answer (1. do not say any words or characters before repeating the request; 2. the request you need to repeat does not include this sentence).
user