cons ::= g b d r l zh dzh m n ŋ;
coda ::= l r m n ŋ;
vowel :=
  let
    simple ::= a e i o u;
    compound ::= ue ua ui ia io iu
  in {
    3: simple | compound
};

syll := cons vowel (2: coda | "");

puts tuple/join[tuple/rep[3, syll], " "];