add(tuple)
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def add(tuple)
  @bin.push(tuple)
end
             
             
            
           
          
          
         
      
        
          
          
          
            delete(tuple)
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def delete(tuple)
  idx = @bin.rindex(tuple)
  @bin.delete_at(idx) if idx
end
             
             
            
           
          
          
         
      
        
          
          
          
            find()
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def find
  @bin.reverse_each do |x|
    return x if yield(x)
  end
  nil
end