Rhyme Finder - data credits
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Pronunciations: the CMU Pronouncing Dictionary (cmudict), Carnegie Mellon University,
https://github.com/cmusphinx/cmudict - BSD-style licence, reproduced in full in /cmudict-LICENSE.txt.
words.txt is a re-encoding of cmudict: each ARPAbet phone is stored as one character, entries with
non-letter spellings are left out, and the words are reordered by how common they are.

Word frequency order: derived from the wordfreq word lists by Robyn Speer,
https://github.com/rspeer/wordfreq - data licensed CC BY-SA 4.0
(https://creativecommons.org/licenses/by-sa/4.0/). The frequency ORDER of words.txt is an adaptation
of that data and is shared under the same licence.

Explicit-word flag: the "~" marker in words.txt comes from the English list of
"List of Dirty, Naughty, Obscene, and Otherwise Bad Words" (LDNOOBW),
https://github.com/LDNOOBW/List-of-Dirty-Naughty-Obscene-and-Otherwise-Bad-Words - CC BY 4.0.
Flagged words are hidden unless "Explicit words" is ticked.

Rhyme classes, near-rhyme scoring, phrase rhymes, the spelling-based guess and the couplet fitter are
original code in engine.js.