You have chosen 'Positivism and Realism' by Moritz Schlick, 'Title, Unity, Authenticity of the 'Categories'' by Michael Frede and 'The Nature of Existence vol.1' by J.M.E. McTaggart
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |