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.

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To someone who wrote he was avoiding social activism because it had been feeding his ego: "And without the activism there is no ego? Better a haughty activist than a self-centered do-nothing!"

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