I can't add more of the 8 buttons in one message

[MrBrainStorm]

def test_cb(bot, event):
bot.send_text(chat_id=event.data['chat']['chatId'],
text="Hello with buttons.",
inline_keyboard_markup="[{}]".format(dumps([
{"text": "Action 1", "url": "http://mail.ru"},
{"text": "Action 2", "callbackData": "call_back_id_2"},
{"text": "Action 3", "callbackData": "call_back_id_3"},
{"text": "Action 1", "url": "http://mail.ru"},
{"text": "Action 2", "callbackData": "call_back_id_2"},
{"text": "Action 3", "callbackData": "call_back_id_3"},
{"text": "Action 1", "url": "http://mail.ru"},
{"text": "Action 2", "callbackData": "call_back_id_2"},
{"text": "Action 3", "callbackData": "call_back_id_3"},
])))
How i can make more buttons?