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What is the purpose behind the lifts? I know this question is under "Muscle Building", but are you lifting for power, size, strength or tone? The best overall mass builders are probably heavy Deads, Squats and Bench. For a more functional lean physique, high rep (or low rep, small rest interval) KB snatches or swings, pullups and pushups will do the trick nicely. A four exercise scheme with KB swings, pullups, squat thrusts (basically, a "burpee" with a pushup and an explosive jump at the end) and an ab exercise like the myotactic crunch or a "toes to bar" leg raise would work great. Especially with limited rest between circuits. You could substitute the Turkish Get Up for the squat thrusts.
Hope that gives you some ideas. It's good to mix things up anyway.
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