## mark a section (Learn more)

irb --> h = Hash.new({}) ==> {} irb --> h[:one] = 1 ==> 1 irb --> h ==> {:one=>1} irb --> h[:two][1] = "one" ==> "one" irb --> h ==> {:one=>1} irb --> h[:three] = 3 ==> 3 irb --> h ==> {:one=>1, :three=>3}

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