['A1', 'B1', 'C1', 'D1', 'A2', 'B2', 'C2', 'D2', 'A3', 'B3', 'C3', 'D3',
    'A4', 'B4', 'C4', 'D4', 'A5', 'B5', 'C5', 'D5', 'A6', 'B6', 'C6', 'D6',
    'A7', 'B7', 'C7', 'D7', 'A8', 'B8', 'C8', 'D8', 'A9', 'B9', 'C9', 'D9',
    'A10', 'B10', 'C10', 'D10']
Using a Python list comprehension a bit like a zip