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- a = [{:name=>"John Doe1", :number=>"5551234567"},
- {:name=>"John Doe1", :number=>"5551234567"},
- {:name=>"John Doe2", :number=>"5557654321"},
- {:name=>"John Doe1", :number=>"5551234567"}]
- [{:name=>"John Doe2", :number=>"5557654321"}]
- a.group_by{|e| e}.select{ |k, v| k[:name].size >=3}.reject
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