Shorten Me: Array Declaration VII (Alphabets)

Task

You have to write an array() function returning an array object with elements as follow:

[ 'a', 'bB', 'c', 'dD', 'e', 'fF',
  'g', 'hH', 'i', 'jJ', 'k', 'lL',
  'm', 'nN', 'o', 'pP', 'q', 'rR',
  's', 'tT', 'u', 'vV', 'w', 'xX',
  'y', 'zZ' ]

Coding Limitation:

Less than 70 characters

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