expr main [(before hand), (before-hand)]
let message "Prefer the single-word adverb `beforehand`."
let description "`Beforehand` functions as a fixed adverb meaning ‘in advance’; writing it as two words or with a hyphen is nonstandard and can jar readers."
let becomes "beforehand"
test "Let me know before hand if you will attend." "Let me know beforehand if you will attend."
test "I prepared the documents before-hand." "I prepared the documents beforehand."
allows "We finished the preparations beforehand."