indicate the place to embed a consonant.
Optional WITH-MAA-SAKOD-RULE is a rule to re-order and modify VOWEL
-follwoing a consonant and preceding a maa-sakod character. If it is
+following a consonant and preceding a maa-sakod character. If it is
nil, NO-MAA-SAKOD-RULE is used. The maa-sakod character is always
appended at the tail.