How to change number of InlineKeyboardButton in InlineKeyboardMarkup?

Question

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def funcion():
    a = ['1', '1'], ['2', '2'], ['3', '3']
    b = []
    for c in a:
        b.append(InlineKeyboardButton(text = c[0], callback_data = c[1]))
    return InlineKeyboardMarkup(row_width=1).add(b)