That ngram looks to be a similar thing (although details will differ), but it's for mysql, not mariaDB. I don't know if it's available for your MariaDB. (I won't be able to help you with it, but perhaps some other monk will step up)
In any case, it seems to me you cannot easily compare everything with everything - it would amount to around a billion comparisons, no? (as you said 31000 square, minus a few). So that's hardly feasible whichever route you take. You need a reduced plan (I think...).
As for the 'indexing': pg_trgm of postgres (and mysql ngram as well, I imagine), consists of converting the words of text into triples of characters (trigrams, or, in the case of ngrams, maybe some other number than n=3), and then comparing the sets of such triples that resulted from each line/verse/record. You can do that without index, on the fly, or with an index, where all the triples are stored beforehand for later use. Of course, it generates large index files (but with this smallish table of 31000 records that's still ok).
Are you posting in the right place? Check out Where do I post X? to know for sure.
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
Want more info? How to link or
or How to display code and escape characters
are good places to start.