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Though the Celtics don’t expect him to be available for their regular-season opener, point guard Rajon Rondo, who wore a small brace on his right knee, showed few lingering effects from surgery to repair a torn anterior cruciate ligament. His 3-point shot was effective and he moved fluidly overall, whether going through drills alone or participating in non-contact drills with teammates. That’s not to say the Celtics’ best player, who declined to comment upon leaving the court, is anywhere close to being ready. “He looks good to me,’’ said coach Brad Stevens. “That being said, he still has a ways to go.’’ The Celtics are preparing for Rondo’s absence by having an offense that, it appears, may be more point-guard-by-committee than before.