The velars are most likely to undergo weakening, then the dentals, and lastly the labials, in that order.
Standardized
IF labials undergo phonological weakening, THEN dentals will have undergone phonological weakening. IF dentals undergo phonological weakening, THEN velars will have undergone phonological weakening.
1.For a similar heirarchy of consonantal weakening discussing major-class and manner, see #1766.2. For a more general claim of the same nature, cf. #1767, about nasals, #1770.
1.For a similar heirarchy of consonantal weakening discussing major-class and manner, see #1766.2. For a more general claim of the same nature, cf. #1767, about nasals, #1770.