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What is cycle time for astm? If x^2+y^2 = 6, and x+y=3, then what is x^3+y^3? Name a class of annelids whose members may have protonephridia? Por que soy mas flexible cada año que pasa y sin hacer estiramientos? Problem involving math induction! If m and n are distinct real numbers, prove that (m+2)^2 = (n+2)^2 if and only if x+y=-4?