598 N.W.2d 742 STATE OF NEBRASKA, APPELLEE, v. DWAYNE TUCKER, APPELLANT. No. S-98-407.Supreme Court of Nebraska. Filed August 20, 1999. 1. Postconviction: Proof: Appeal and Error. A defendant requesting postconviction relief must establish the basis for such relief, and the findings of the district court will not be disturbed unless they are clearly erroneous. 2. […]