Graphemes: b
Classes: voiced bilabial stop consonant
Implicit classes: obstruent C
Features +voice labial -sonorant -continuant
Related rules
Origin
ce-nasal-metathesis: bm > mb, dn > nds-vocalize-voiceless-stop: b > u / V_[+voice,-sonorant,-continuant], g > i / V_[+voice,-sonorant,-continuant]s-mb-nd: b > m / m_, d > n / n_