A triglyceride fat is composed of three fatty acids that are 18 carbons long. The fat is broken down to glycerol and fatty acids. Glycerol is modified to glyceraldehyde-3-phosphate and enters glycolysis. The fatty acrylic tails have two carbon acetyl units removed at a time, which then enter the citric acid cycle as acetyl-CoA. How many turns of the citric acid cycle are required to completely oxidize this triglyceride fat to CO2?