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Switch The Items Around In An Array
a = [['b2','a1'],['d2','c1']]
a.map!{|x,y| [y,x]} # => [["a1", "b2"], ["c1", "d2"]]
# or
a.map!{|x| x.reverse} # => [["a1", "b2"], ["c1", "d2"]]
# or
a.map!(&:reverse) # => [["a1", "b2"], ["c1", "d2"]]
