Improve Triennial meaning in Urdu

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سَہ سالہجو تین سال کے بعد واقع ہوجو تین سال تَک رہےسہ سالہ

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سَہ سالہجو تین سال کے بعد واقع ہوجو تین سال تَک رہےسہ سالہ

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