Bip39 Ian Coleman Some words are shorter than four letters, such as the word “act”. Other words are extended than 4 letters, like “abstract”. You'll be able to see the entire source code in standalone, offline html file. Alternatively you may check the individual css and js documents in the https://getidealist.com/story20321750/how-to-generate-seeds-indicators-on-seed-phrase-generator-you-should-know