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| English | Russian |
| improper performance | ненадлежащее исполнение обязательств (expenses sustained by the City Colleges of Chicago due to Contractor's other improper performance hereunder, repudiation of the Contract by the Contractor, ... Alexander Demidov) |
| nonperformance or improper performance | неисполнение или ненадлежащее исполнение (ABelonogov) |