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 98: Impurity of Food and Drink
Leviticus 11:34 "Of all the food which may be eaten...and all drink that may be drunk"

Food and drink can become impure if they have come in contact with a source of impurity.

The first stages of your life are to learn to be a master over yourself. But then comes a major and difficult transition in life, when you take on the responsibilities of a family. Now you must learn to put aside your own self improvement for their sake. But you surely realize that, in the long run, what is best for them will be best for you.

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