�?�?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 Be aware: Drillopedia.com is often a submission-dependent information-sharing web site. Contributors post info centered Successfully Submitted (Awaiting Approval)