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The 331 model in particle physics offers an explanation of why there must be three families of quarks and leptons.

One curious feature of the Standard Model is that the gauge anomalies cancel exactly for each of the three known quark-lepton families independently.

The Standard Model thus offers no explanation of why there are three families, or indeed why there is more than one family.

Western Star Trucks Sales, Inc., commonly designated Western Star, is an American truck manufacturer headquartered in Portland, Oregon, United States and a subsidiary of Daimler Trucks North America, in turn a wholly owned subsidiary of the German Daimler AG.

Overdrive is a term used to describe the operation of an automobile at sustained speed with reduced engine revolutions per minute (RPM), leading to better fuel consumption, lower noise and lower wear.

Use of the term is confused, as it is applied to several different, but related, meanings.

The model year (MY) of a product is a number used worldwide to describe approximately when a product was produced, and it usually indicates the coinciding base specification (design revision number) of that product.

A tractor is an engineering vehicle specifically designed to deliver a high tractive effort (or torque) at slow speeds, for the purposes of hauling a trailer or machinery used in agriculture or construction.

Most commonly, the term is used to describe a farm vehicle that provides the power and traction to mechanize agricultural tasks, especially (and originally) tillage, but nowadays a great variety of tasks.

Agricultural implements may be towed behind or mounted on the tractor, and the tractor may also provide a source of power if the implement is mechanised.