___ twelve years, Opal Systems has been designing operating systems for government institutions.
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During twelve years opal systems has been designing operating system for government institutions
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AnswerDuring twelve years, Opal Systems has been designing operating systems for government institutions.
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बारह वर्षों के लिए, ओपल सिस्टम सरकारी संस्थानों के लिए ऑपरेटिंग सिस्टम डिजाइन कर रहा है।
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