1. Friedrich did not minor in botany.
2. Either Gloria or myself or both took philosophy.
3. Both girls either majored or minored in botany.
1. Between them, Melrose and Roberta took all four classes.
2. I did not minor in botany.
3. Roberta is a Liar.
1. I majored or minored in math.
2. Friedrich is a Liar
3. Roberta majored in history.
1. Melrose did not major or minor in math.
2. I majored or minored in philosophy
3. Gloria minored in math.
Which are the Liars and the Knights, and what did they major and minor in?