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Eric Dawson’s 82 seconds of garbage time for the San Antonio Spurs ended up being a going-away present. After knocking down three jumpers on three attempts in Friday night’s victory over the Dallas Mavericks, the Spurs released Dawson from his 10-day contract Saturday and announced the signing of Justin Dentmon from the Austin Toros of the NBA Development League to a 10-day contract. A 6-0, 185-pound guard, Dentmon has appeared in 38 games with the Toros this season, averaging a team-best 22.9 points,