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.
Positive Mitzvah 248
Laws of Inheritance
Numbers 27:8 "If a man dies and he has no son..."
HaShem blesses us with life and possessions.
When someone passes away, the property which HaShem has granted him is inherited by his children or next of kin.
This Positive Mitzvah concerns the many detailed laws of inheritance.
We should always remember that material possessions are not only things that are passed on to us by our parents.
The greatest inheritance we receive is our Jewish soul and connection to our Torah heritage. Thus, we add one more link in the everlasting chain of the Jewish People and in our devotion to the greatest gift of HaShem - the Torah.