Please do my Martian homework My homework is to write a Martian essay (see below) between 729 and 810 words, inclusive.  Your task is to write a program that will generate the essay.

History

Around the turn of the 20th century, spiritualist Catherine-Elise Müller allegedly communicated with Martians.  During somnambulatory trances, she would write out Martian scripts.  Psychologist Théodore Flourney discovered her Martian writings were very similar to her native French, and in his book "From India to the Planet Mars", he documented Catherine's Martian alphabet.

The following is loosely based on that alphabet with an extended mythos.

Problem Description

The Martian language has 21 letters, shown here next to each Latin equivalent:



Unfortunately, there's no Unicode for Martian (despite Mars being part of the universe), so we're stuck using Latin characters.

Whereas in English our phonemes break out into two major types (consonants/vowels) which we loosely map to letters, Martian has three letter types:


The vowels: a e i m n o u
The hard consonants: b c d g k p t
The soft consonants: f h l r s v z


In addition to this, the Martian language contains a single punctuation mark--the period.

A Martian word is a set of 3 to 9 letters.  All Martian words have at least one vowel, one hard consonant, and one soft consonant (in any arrangement).  For example, fng, cdaz, vpi, and pascal are Martian words.

A Martian sentence is a set of 3 to 9 Martian words delimited by spaces and followed by a period.

A Martian paragraph is a set of 3 to 9 Martian sentences delimited by spaces and followed by a newline.

A Martian essay is a collection of Martian paragraphs that contains no contiguous word repetitions.

A contiguous word repetition is any construct S S where S is a contiguous set of words.  Note that this definition ignores sentence and paragraph boundaries.

Examples

Please note: There's a single trailing newline following each example (since all Martian paragraphs end in a newline)

Not Martian essay

lorem ipsum dolor sit amet. quis nostrud exercitation ullamco laboris.



...for many reasons.  This example is to illustrate some miscellaneous rules:


lorem is not a Martian word because it has no hard consonants.
amet is not a Martian word because it has no soft consonants.  (m is a Martian vowel).
quis is not a Martian word because it has no hard consonants
quis is not a Martian word because q is not a Martian letter
exercitation is not a Martian word because it has more than 9 letters
exercitation is not a Martian word because x is not a Martian letter


Martian essay

fng cdaz vpi. pascal broke basic. popplers taste great.



...because it is a Martian paragraph.  The Martian paragraph contains three Martian sentences.

Not Martian essay

fng cdaz vpi. pascal broke basic. free pascal rules.



...since free pascal rules. is not a Martian sentence, because neither free nor rules are Martian words, because they do not have any hard consonants.

Martian essay

fng cdaz vpi. pascal broke basic. popplers taste great.
cdaz vpi fng. basic breaks pascal. popplers punch hard. fng cdaz vpi.



...which contains two Martian paragraphs.  The sentence fng cdaz vpi. appears twice, but that's perfectly fine.

Not Martian essay

popplers taste fng. cdaz vpi pascal. broke fng cdaz vpi.
pascal broke omicron planets. basic scares goats. vpi piv vpi.



...because the construct fng. cdaz vpi pascal. broke fng cdaz vpi. [nl] pascal broke is a contiguous word repetition.

Challenge

Your challenge is to write a function or program that accepts no input, which produces as its output my homework; that is, your program should generate a Martian essay between 729 and 810 words (inclusive).  Keep in mind, your program's output must be a valid Martian essay, but you don't have to generate it randomly or different each time.  Anything you do to generate a valid Martian essay counts.

I've written a C++ program to check essays that you're allowed to use.

This is code golf.  Shortest code in bytes wins.  Standard loopholes disallowed.
Jelly, 28 26 25 24 23 bytes

-1 byte thanks to carusocomputing (replace the word thimble with abcdefg)

9ØaḣŒ!s²ḣµs9K€;€”.K;⁷µ€


TryItOnline!

How?

Makes a list of all 362880 permutations of the first seven nine letters of the English alphabet abcdefghi, which all have the properties of Martian words and are all distinct, and formats them into an essay using the first 729 words.

9ØaḣŒ!s²ḣµs9K€;€”.K;⁷µ€ - Main link: no arguments
9                       - 9 as x
         µ              - monadic chain separation
 Øa                     - yield lowercase alphabet
   ḣ                    - head to x ("abcdefghi")
    Œ!                  - all permutations (362880 distinct Martian words)
       ²                - square x = 81 
      s                 - split into chunks of length 81 (the paragraphs)
        ḣ               - head to x (get the first 9 paragraphs only)
                     µ€ - monadic chain for €ach (for each chunk:)
          s9            -     split into chunks of length 9 (the sentences)
            K€          -     join with spaces for €each (between words in each sentence)
              ;€        -     concatenate €ach with
                ”.      -         '.' (add a full stop* after each sentence)
                  K     -     join with spaces (add a space between the sentences)
                   ;    -     concatenate with
                    ⁷   -         a line feed
                        - implicit print


* period