|- ! !b !p !m !f |- !simp. and trad.(ㄅㄆㄇㄈ) | ㄅ | ㄆ | ㄇ | ㄈ |}
ㄅㄆㄇㄈ
From the first four letters of Zhuyin: ㄅ (b), ㄆ (p), ㄇ (m), ㄈ (f)