must be maintainedshould be maintainedshould be keptmust be keptneeds to be maintainedneed to maintainhas to be maintainedneeds to be keptmust be supportedneeds to be sustained
should be maintainedmust be preservedshould be preservedshould be reservedmust be retainedmust be maintainedneed to be maintainedhave to be maintainedshould be retainedmust be reserved
should be maintainedmust be preservedshould be preservedshould be reservedmust be maintainedhas to be preservedmust be keptmust be retainedneeds to be preservedshall be reserved
следва да се поддържа
should be maintainedmust be maintainedshould be kept
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