. State v. Russell, 000 Neb. 000, 000 N.W.0d 000 (0000). An abuse of discretion occurs when a trial court's                                - 000 -            Nebraska Supreme Court A dvance Sheets                    000 Nebraska R eports                          STATE v. STEELE                         Cite as 000 Neb. 000  decision is based upon reasons that are untenable or unreason