self-contradiction vs unevenness

self-contradiction

noun
  • A statement that contains a contradiction, or a premise from which one could be derived 

unevenness

noun
  • The result or product of being uneven. 

  • A rough or uneven thing. 

  • The quality or characteristic of being uneven; irregularity; inconsistency; the lack of smoothness or continuity. 

How often have the words self-contradiction and unevenness occurred in a corpus of books? (source: Google Ngram Viewer )