Finding an object(s) within an array with specific letter using Ruby -

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So I am trying to make a method that takes an array and a letter as a logic and A new array is included in that letter.

I have this too far: 

  DF finder (array, cheese_f_fund) find = array.keep_if {| X | X.include? (Thing_to_find) == true} Return search terminated   
 When I run programs in Ruby, this is saying. Include? There is no valid block method.  
 Any suggestions?   
 
 
 You can type more simple -  
  def finder ( Array, cheese_t_wind) array Selection {| Words | Word.include? Thing_to_find}   
    From each attribution  word  to that  array  in each iteration block Will pass. Now  word.include? (Thing_to_find)  will be evaluated - if it returns  true , then the  word  will be selected and the  temporary  array, otherwise Not once, all the iterations will be awarded with the  array , then returning that array to all the selected elements of each block execution, which were being stored in the  temporary  array will be given.

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