Language Asymmetries

P and g are slightly more prone to deletion from otherwise symmetrical systems. Arabic is my favorite and always has it because it deletes both of them. There's actually an entire walls article 5a dealing with this very issue. One kind of asymmetry you sort of expect to have nasals in most of your places of articulation except the velour in is very rare outside of certain conditioned environments. It's very common as a syllable coda or especially some sort of nasal simulation before a viewer's stop.