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• a  possible but not necessary; left to personal choice

• I resent that! so MG offered an optional high-performance engine with dual overhead cams, thus the "twin cam.
• But while it is optional in the bill adopted by the Texas senate, the death penalty remains mandatory for a second offense in the House version.
• Granted many of the SAT-optional schools sit on utopian campuses in liberal New England villages.

• obligatory

News & Articles

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• ANN's Daily Aero-Term (06.22.13): Basic Empty Weight
  Standard empty weight plus optional equipment.
  June 22, 2013 - The Aero-News Network
• Hollywood Park: Freakin Rocket headed for Oceanside at Del Mar
  INGLEWOOD, Calif. - Freakin Rocket, unbeaten after two starts following a victory in an optional claimer for sprinters Thursday, will start on turf in the $100,000 Oceanside Stakes at Del Mar on July 17.
  June 21, 2013 - Daily Racing Form
• Budget bill would make it optional for California local governments to comply with public records laws
  A budget bill awaiting Gov. Jerry Brown's signature would make it optional for local governments to comply with several key provisions of the California Public Records Act.
  June 19, 2013 - The Sacramento Bee

Quotes

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• David Petraeus in AFP
  On this important endeavour, co-operation is not optional,Petraeus added.
• Terry Francona in 940 News
  We'll take a step back tomorrow and have an optional workout,Red Sox manager Terry Francona said. "We tried to do our homework on what to expect from travel. We're not going to talk ourselves into being tired and will do what we need to do...