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Exhaust gases are generated from the combustion chamber after the air-fuel mixture is burnt through the Power Stroke. These exhaust gases are "thrown out" in the combustion chamber through the Exhaust Stroke. The exhaust gases, including NOx, move through the Exhaust Valve, the Exhaust Passages and finally towards the atmosphere over the Exhaust System. A digital personal health record (PHR) can be a computer-based software that lets you store a variety of personal health information including illnesses, hospitalizations, encounters (i.e. visits and communications), journal information in between doctor visits, medications, allergies, immunizations, surgeries, lab results, and ancestors and family history. The personal health record differs from an electronic digital medical record which can be a similar application with considerably more all-encompassing features used by healthcare providers for example scheduling and insurance billing, besides the storage of patient health data. Owning and looking after an up-to-date digital personal health record has several benefits and is the cornerstone of proactive healthcare involvement and better healthcare experiences.