5, 95 S.Ct. 2160) Federal Rules of Civil Procedure, see Rule 26(b)(3), and in Rule 16 of the Criminal Rules as well, see Rules 16(b) and (c); cf. E. Cleary, McCormick. on Evidence 208 (2d ed. 1972). [17][18][19][20][21) Ths_privilege de- rived from tile work-product doctrine is nqt abatitutictike oth