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
-nil, NO-MAA-SAKOD-RULE is used. The maa-sakod character is alwasy
+nil, NO-MAA-SAKOD-RULE is used. The maa-sakod character is always
appended at the tail.
For instance, rule `(\"\e(1`WM\e(B\" (?\e(1`\e(B t ?\e(1W\e(B ?\e(1M\e(B))' tells that this vowel