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.

Negative Mitzvah 253: It is forbidden to cheat a convert in business
Exodus 22:20 "We are forbidden to cheat a convert in business deals"

In any case involving business deals, buying or selling, it is forbidden to cheat the convert.

The Torah gives us a special commandment in regard to the Ger in order to make sure that we treat any convert to Judaism just as we would treat any other Jew.

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If you want to see the face of the Moshiach, just look at the children!

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