paragraphs = paragraph [NIhO ... # paragraphs]
paragraph = (statement | fragment) [[I # [[statement | fragment]] ...
fragment has been reduced to statement.
statement has been reduced to subsentence.
We now have:
(subsentence) [[I # [[subsentence]]: reduces to "jo'u gi subsentence gi subsentence" which is a subsentence.
(If the second subsentence is not present after an I, use "co'e".)
After reducing every paragraph to subsentence, we reduce paragraphs, starting from the innermost:
subsentence [NIhO ... # subsentence]: reduces to "jo'u gi subsentence gi subsentence"
Thus paragraphs is reduced to subsentence.