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Created February 25, 2016 21:50
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main.rb
require 'set'
h = {
a: Set.new,
b: Set.new,
c: Set.new
}
# Keys :a, :b and :c are known.
h[:a] = h[:a].to_a
h[:b] = h[:b].to_a
h[:c] = h[:c].to_a
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