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 252: It is forbidden to hurt a convert's feelings
Exodus 22:20 "You shall not wrong a stranger"

A "Ger" is a person who converted to Judaism and took upon him-or herself to keep the Torah and Mitzvot.

We are commanded not to hurt his feelings or say anything that may cause the Ger to be embarrassed or feel uneasy.

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Give a child kind, non-predatory stuffed animals to play with, like sheep, deer, giraffe and such. What the child looks at in those delicate years has a permanent effect.

And earlier still: Life starts in the womb. Sing to the fetus good things and let it hear words of Torah.

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