As in any business relationship, the writing and delivery of a cover letter follows specific rules of etiquette. (CoverLetterExamples.net)
There are very specific rules for how to serve the other party, because the court must ensure that service has taken place. (familylawhelp.ca)
Parents, especially first - time ones, often look for specific rules about what to feed their baby and how much to give them at every stage of their first year of life. (verywellfamily.com)