Rambam - Sefer HaMitzvos: Positive Mitzvah 222: Positive Mitzvah 222

This is not an error of duplication. The full-fledged version of this Mitzvah are many and change for those who are learning the one/three chapter a day. The Message for the day from "Bringing Heaven Down to Earth" at the end of this Mitzvah is different than that of yesterday.

Positive Mitzvah 222: Divorce Procedure
Deuteronomy 24:1 "Then let him write her a bill of divorce and place it in her hand"

The Torah teaches us the proper manner through which a Jewish marriage becomes a union of holiness. If for some reason a marriage must be ended, there are specific laws that must be followed.

This Positive Mitzvah details the manner in which a couple may divorce.

There is no place for worry. You try to decide a course of action. If you do not have the experience to decide, ask the advice of someone who does -- a parent, a teacher, an expert -- someone reliable, but also someone who is conscientious of your spiritual path.
Once you have decided what should be done, you follow that course and you trust in G-d that since you are doing what you believe to be the right thing, He will insure that everything will go well.

From: Bringing Heaven Down to Earth by Tzvi Freeman - tzvif@aol.com