KD 2010 consists of four hierarchical levels that are marked as follows:
• the first level of classification is the sector and it is marked with single letter
• the second level of classification is the area and it is marked with two-digit number
• the third level of classification is the branch and it is marked with three-digit number
• the fourth level of classification is the group and it is marked with a four-digit number.
Level 1: 21 sections identified by alphabetical letters A to U;
Level 2: 88 divisions identified by two-digit numerical codes (01 to 99);
Level 3: 272 groups identified by three-digit numerical codes (01.1 to 99.0);
Level 4: 615 classes identified by four-digit numerical codes (01.11 to 99.00).
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