Benchvale 2,048-word passphrase list

Derived from EFF's large wordlist (CC BY 3.0 US), 7,776 words.
Source file in this repository: data/eff_large_wordlist.txt
Fetched from https://www.eff.org/files/2016/07/18/eff_large_wordlist.txt

The rule, applied in this order:

1. Drop any word that is not plain lowercase a-z. The EFF large list contains
   four hyphenated entries; they cannot appear in a list this page publishes
   as lowercase a-z.
2. Keep words of 4 to 6 letters inclusive (L_min=4, L_max=6).
3. Keep only the alphabetically-first word of each group sharing its first
   4 letters (N=4).
4. Sort the remainder ascending.
5. Take the first 2,048.

Parameters fixed at file-creation time: L_min=4, L_max=6, N=4.
Resulting count: 2,048.

Re-run: node scripts/derive-wordlist-2048.mjs

We do not use the EFF 7,776-word list itself. 2,048 words is exactly 11 bits
per word, which is what makes the arithmetic on /dev/passphrase-generator
checkable by hand.