Links
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  http://www.investopedia.com/university/ratios/liquidity-measurement/ratio3.asp   
  http://www.investopedia.com/university/ratios/liquidity-measurement/
  http://www.bauer.uh.edu/rsusmel/phd/lecture%207.pdf
  https://kelley.iu.edu/cholden/Goyenko%20Holden%20and%20Trzcinka%20(2009).pdf
  Convenient liquidity measure for financial markets
  Oleh Danyliv, Bruce Bland, Daniel Nicholass,  https://arxiv.org/pdf/1412.5072.pdf

  https://www.jstor.org/stable/2490741?seq=1#page_scan_tab_contents
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Number grades to letter grades
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Prompt: I plan to convert a number grade to a letter grade. The cut-off points are 90,80,70,60, and 50.
        The letter grades are A, B, C, D, E, and F (for a failure). For example, 
        if a grade is above or equal to 90, the student will get an A. Please write a Python function.

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What kind of programming lanuages 
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According to Horsey (2023), ChatGPT could support the following 
  programming lanuages

 1. Python: A high-level, general-purpose programming language often used for
    web and software development, data analysis, machine learning, artificial
    intelligence, and scientific computing.

 2. JavaScript: A scripting language primarily used for enhancing interactivity
    and providing rich web content. It’s a crucial part of web development, 
    working alongside HTML and CSS.

 3. Java: A high-level, object-oriented programming language often used for building
    enterprise-scale applications. It’s known for its "write once, run anywhere" 
    philosophy.

 4. C++: A general-purpose programming language with low-level memory manipulation
    features. It’s commonly used for system/software development, game development,
    and embedded systems.

 5. C#: A modern, object-oriented programming language developed by Microsoft,
    primarily used for developing Windows desktop applications and games with 
   the Unity game engine.

 6. Ruby: A high-level, interpreted programming language that prioritizes simplicity 
    and productivity. It’s frequently used for web application development, particularly
     with the Ruby on Rails framework.
 
 7. Swift: A programming language developed by Apple for iOS, macOS, watchOS, and tvOS
    app development. It’s known for its simplicity and safety features.

 8. R: A language and environment for statistical computing and graphics.
    It's extensively used in data analysis and machine learning.
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