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We take great care to ensure that important matters such as this are properly managed/processed/implemented,although due to ( 简略描述原因 ) , so on this occasion an acceptable standard has clearly not been met/we have clearly not succeeded in meeting your expectations. In light of this, we have decided to ( 解决方案 ),which we hope will be acceptable to you,and hope also that this will provide a basis for continuing our relationship/your continued custom.