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@data_array_ref = [
    mykey1 => {firstkey => 'firstvalue', secondkey => 'secondval' }
...
    mykey4 => [ [4, 5, three] [6, 7, four] [8, 9, five] ]
]

mykey1 => firstval, secondval
mykey2 => turtle, Dennis
mykey3 => one, two, three
mykey4 = 4, 5, three, 6, 7, four, 8, 9, five