user: What's changed and unchanged for IKEA pencils through the years?

assistant: The color changed from blue, to yellow to the natural color of wood. The dimensions of the pencil has never changed which is always 7 x 87mm.

user: I want to become a pro MMA fighter. How can I go about doing so?

assistant: There are many different avenues that you can take in order to become a pro Mixed-Martial Arts fighter. To be successful will require a lot of discipline and hard work. Here is one potential path which you may consider: 

1) Improve you general fitness: In order to become a successful MMA athlete you need to have good general fitness. This can include things like strength training, yoga (flexibility) and cardio (swimming, running, etc). 

2) Get a breadth of experience: It is helpful to get competency in the various specialties that are found in MMA fights so you can adequately handle all styles that may be employed at the time.  At a high level, this can be split into two sections: 
    - Striking: Relevant marital arts you may want to consider training is Boxing, Kickboxing, Muai-Thai. 
    - Grappling: Relevant marital arts you may want to consider training in is Brazilian Jiu-Jitsu, Sambo, Freestyle Wresting. 

3) Consider specializing: While it is good to have a breadth of different techniques, really honing in on one sub-discipline can give you an edge in comparison to other fighters. For example, Khabib Nurmagomedov has found success with a wrestling base. 


These are just some starting points to consider when thinking about becoming a professional MMA athlete. Soft Skills like networking and marketing are also very important once you reach more professional levels of the sport.

user: Which is a species of fish? Tonguefish or Tongue

assistant: Tonguefish