transpose.rb
# Array#transpose
a = [[1,2,3],[4,5,6],[7,8,9]]
a.transpose
#=> [[1, 4, 7], [2, 5, 8], [3, 6, 9]]
# same return
a[0].zip(*a[1..-1])
#=> [[1, 4, 7], [2, 5, 8], [3, 6, 9]]
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