positional variant (does not occur in isolation)
Based on Maciołek & Tambor (2012)
Voiceless: the vocal folds are separated, not vibrating, the air flows freely between them.
Palatal: the middle of the tongue lies against the hard palate in the highest part of its vault.
Nasal: there is a closure in the oral cavity, the soft palate moves away from the back of the pharyngeal cavity and enables the free flow of air through the nasal cavity and out. After that, the closure in the oral cavity is released.