OPEC means Organization of Petroleum Exporting Countries, which is a group of oil producing countries that regulate the amount of oil each country is able to produce. An example of OPEC members are Saudi Arabia, Iran and Iraq.
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1 prophet Mohammed
2 prophet Mohammed is the massanger
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knights they were metal plate armor but the earlier Knights would where Clad in tough leather or perhaps a chain mail shirt called a hauberk (in French) or byrnie (in English), like their earlier Roman counterparts.