A little more about the footnote (สํ.ส.อ. ๑/๒๙/๕๒) from อรรถกถาเล่มที่ ๑๑ ภาษาบาลี อักษรไทย:

๙. จตุจกฺกสุตฺตวณฺณนา [๒๙] นวเม จตุจกฺกนฺติ จตุอิริยาปถํ. อิริยาปโถ หิ อิธ จกฺกนฺติอธิปฺเปโต. นวทฺวารนฺติ นวหิ วณมุเขหิ นวทฺวารํ. ปุณฺณนฺติ อสุจิปูรํ. โลเภน

In English :
(29) Catucakka –– Four WheelsBorn from dust we are four wheels, nine entrancesAnd merit mixed with greed.Hero, how should we proceed?”“Cut, interest, the straps, desires, greed and demerit,Also uproot craving completely and then proceed.”

And more (from Google AI overview) :
In Buddhism, the concepts of “four wheels” and “nine entrances” are frameworks used to describe different aspects of the path to enlightenment and the nature of existence within specific traditions, primarily Tibetan Buddhism. The Four WheelsThe term “four wheels” (or “four Mahayana Dharma wheels”) refers to the external conditions that are considered conducive to spiritual development. In Tibetan Buddhism, they also represent vital energy centers (chakras) in the body related to meditation and the experience of bliss. External Conditions for Spiritual Progress These four conditions support the path to enlightenment:

Relying on holy beings: Seeking guidance from enlightened teachers or spiritual friends.Abiding in a harmonious environment: Practicing in a supportive and conducive place.Having supportive family and friends: Being surrounded by people who encourage one's spiritual aspirations.Collecting merit and making prayers: Engaging in virtuous actions and prayers to build positive karma. 

Energy Centers (Tibetan Buddhism)In the tantric traditions, the four wheels are specific subtle body centers where blisses arise:

The Wheel of Great BlissThe Wheel of EnjoymentThe Wheel of DharmaThe Wheel of Transformation

The Nine Entrances (Nine Vehicles)The “nine entrances” likely refers to the Nine Vehicles (Sanskrit: nava-yāna; Tibetan: theg pa dgu), a hierarchical classification of all the Buddha’s teachings into nine paths or stages found specifically in the Nyingma school of Tibetan Buddhism. These vehicles are seen as different approaches tailored to practitioners of varying capacities. The nine vehicles are grouped into three outer (sutra) vehicles, three outer tantras, and three inner tantras:

Three Causal Vehicles of Characteristics (Sutra Tradition):    Śrāvaka Vehicle: The path of the "hearer" or pious attendant, seeking individual liberation from samsara (the cycle of rebirth).    Pratyekabuddha Vehicle: The path of the "solitary realizer," who achieves enlightenment independently but does not teach others.    Bodhisattva Vehicle: The path of the spiritual aspirant who seeks enlightenment for the benefit of all sentient beings (Mahayana Buddhism).Three Outer Classes of Tantra:    Kriyā Tantra: Emphasizes external conduct, cleanliness, and ritual actions.    Charya Tantra: Places equal emphasis on external actions and inner meditation (yoga).    Yoga Tantra: Emphasizes inner meditative practices, combining skillful means and wisdom.Three Inner Classes of Tantra:    Mahāyoga: Focuses on the development stage (visualization of deities).    Anuyoga: Focuses on the completion stage (inner yoga of channels, energies, and essences).    Atiyoga (Dzogchen): The "Great Perfection," considered the pinnacle vehicle based on direct access to pure awareness, bypassing elaborate processes

[I think that AI overview is off the mark on ๙ ประตู, and goes to explain Nine Vehicles instead. AI answers are not always reliable, right? ]