en a common legal defense interest, which cloaks related communications in privilege, and a common problem, to which the privilege does not apply. Cgiazaryan, 290 F.R.D. at 434 (citing Finkeiman v. Klaus, 2007 WL 4303538, at *4 (N.Y.Sup.Ct. Nov. 28, 2007)). "IA] limited common purpose (that) necessitates