Every eligible word gets its opening consonant cluster — everything up to the first vowel — stripped and replaced with sn. If a word starts with a vowel, sn is simply prepended.
Articles, prepositions, conjunctions, pronouns, auxiliaries, contractions (I'm, don't…), and common filler words are left untouched. Proper nouns are fair game. Words already starting with sn are left alone.
Sparse replaces exactly one word per line. Moderate targets around two. Heavy replaces every eligible word. Capitalisation always follows the original word.
Inspired by: Take me to snurch (snail church)