What is philosophy?

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Across
  1. 3. Study of knowledge and how we justify knowledge.
  2. 4. Study of concepts such as "beauty" and "ugliness"
  3. 6. An Argument that relies on certainty to be valid and sound.
  4. 7. Study of correct reasoning and argumentation.
Down
  1. 1. Study of concepts such as "right" and "wrong".
  2. 2. Study of the fundamental nature of reality.
  3. 5. An argument that relies on probability to be valid and cogent.