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6. The use of smaller words and shorter sentences Obsessive-compulsive disorder (OCD) Photo Credit: Jason Bache The EGR system routes a number of the exhaust gases (6 ? 10%) through the EGR valve, back in for the Intake System, and finally inside combustion chamber. The exhaust gases are inert i.e. they do not burn inside the combustion chamber; also, the exhaust gases occupy a few of the space which may otherwise be taken from the intake air. This cuts down on level of intake air readily available for the combustion process during each Power Stroke; which often decreases the peak combustion temperatures. This ends in lower NOx emissions. When owning an OCD, patients usually have inflation of responsibility or they overestimate their responsibilities. This happens whenever a certain individual don't go to work for just a day and believes that the business organization's operations will stop and should not meet its quota as a consequence of his absence. This can be avoided by involving themselves in habits or thoughts that will neutralize or ease the possible negative outcome of their absence at work.