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So, what's the difference between Rho and Pi, or Zeta and Epsilon levels? Has it ever been specified.?

PS: If this sounds a strange question, it's because despite being an avid fan of WH40K, I unfortunately suffer from the total lack of any WH40K materials in my locale. Life is cruel. [[User:MarqFJA87|MarqFJA87 (All things are below Justice. All things are encompassed by Mercy.)]] 23:17, 25 September 2010 (UTC)