[button_message_1_a]
[install_message_1] |
[button_message_1_b]
[button_message_4_a]
[install_message_4] |
[button_message_4_b]
[button_message_3_a]
[install_message_3] |
[button_message_3_b]
[button_message_2_a]
[install_message_2] |
[button_message_2_b]
[button_back_1]
[button_back_2]
[button_next_1]
[button_next_2]