syntax - How can I nest this if/else as per Ruby? -

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I want to do it in Ruby: 

  some () conditional and some other_else ()

It does not compile, nor is anything that I tried. Is it possible to make a statement in this format or do I : 

  if something is conditional and some_all () end   
  if conditional, then something else ends  
 
 or 
 
  conditional? Some: some_all

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