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www.reference.com/article/co-op-159c66f5e38e7ccb

A co-op is a group of individuals who work together for mutual economic, social or cultural benefits. The word "co-op" also often refers to a group of people who serve as a board over a condominium building or subdivision.

www.reference.com/article/did-black-ops-2-come-out-4091298dfd4d6b89

The video game "Call of Duty: Black Ops II" was released for the PC, PlayStation 3 and Xbox 360 platforms on November 12, 2012. This first-person shooter was developed by American game developer Treyarch and published by Activision.

www.reference.com/article/better-black-ops-2-519cadbfae1f0066

There are multiple ways to improve your skill and accuracy in the video game "Call of Duty: Black Ops 2." The best way is to practice in the single-player campaign mode to become more comfortable with the control scheme and to hone your senses. This includes learning to listen for the sounds of appr

www.reference.com/article/op-art-272a54dc94b769f5

Op art is an art movement that includes paintings, sculptures and prints that rely on optical illusions or other techniques that alter perception for particular effects. The name "op art" is short for "optical art."

www.reference.com/article/black-ops-3-game-443e1c54a5331811

Activision plans to release "Call of Duty: Black Ops 3" for Playstation 4, Xbox One and PC systems. There is no exact date for release. It is possible to pre-order "Black Ops 3." Those who pre-order the game gain exclusive access to the beta-testing phase.

www.reference.com/world-view/ops-baseball-5a88617a205607c6

On-base plus slugging percentage, or OPS, is a baseball statistic that is calculated by combining a hitter's on-base percentage and slugging average. The statistic is a form of sabermetrics, which is a mathematical analysis of game activity.

www.reference.com/article/call-duty-black-ops-come-out-390012595aff8abb

"Call of Duty: Black Ops" was released on Nov. 9, 2010, for PC, PS3, Xbox 360, Nintendo Wii and Nintendo DS. "Call of Duty: Black Ops 2" was released on Nov. 13, 2012, for PS3, Xbox 360 and PC.

www.reference.com/world-view/pre-op-blood-work-test-c090cbfb52922296

Experts from the National Institutes of Health say pre-op blood work helps medical professionals determine if a patient is healthy enough to undergo a surgical procedure. Some pre-operative blood tests are ordered for every patient scheduled for surgery, while other tests are only ordered if a patie

www.reference.com/article/can-game-mods-black-ops-2-15aa13a8a3c9e798

Mods for "Call of Duty: Black Ops 2" are available at BlackOps2Mod.net and TheTechGame.com. Examples of some of the free mods on these sites include Black Ops 2 – Zombie Mods and Black Ops 2 Mod.

www.reference.com/article/black-ops-2-twitter-account-ba7ba513a7dc61a4

"Call of Duty" has an official and verified Twitter account, @CallofDuty. The account features tweets about several games in the franchise, including "Call of Duty: Black Ops II."