�?�?t ε l ρ l v l + �?�?ε l ρ l v l v l = ε l �?�?τ l + ε l ρ l g �?ε l �?p �?β v l �?v s Observe: Drillopedia.com is actually a submission-centered expertise-sharing site. Contributors submit facts primarily based on waiting for link from Forum Profiles (6)