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PRINCIPAL ACCOUNTING POLICIES (Tables) | 6 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2022 | Sep. 30, 2022
PRINCIPAL ACCOUNTING POLICIES |  |
Summary of property, equipment and software | ​
​ | ​ | ​
Category |  | Estimated useful lives
Electronic equipment | ​ | 3-5 years
Leasehold improvement | ​ | Shorter of lease term or estimated useful life of the assets
Furniture and fixtures | ​ | 5 years
Motor vehicles | ​ | 3-5 years
Software | ​ | 5 years
Summary of intangible assets | ​
​ | ​ | ​
Category |  | Estimated useful lives
Domains | ​ | 10 years
​ The estimated useful lives of domains are the periods over which they are expected to be available for use by the Group, which are mainly determined based on the periods of effective registration of the domains. ​
2. | PRINCIPAL ACCOUNTING POLICIES (CONTINUED)
Summary of total revenue | ​
​ | ​ | ​ | ​ | ​
​ |  | For the six months ended June 30,
​ |  | 2021 |  | 2022
​ | ​ | RMB | ​ | RMB
Online recruitment services to enterprise customers | ​ | ​ | ​ | ​
– Key accounts | ​ | 362,763 | ​ | 517,925
– Mid-sized accounts | ​ | 633,685 |  | 910,848
– Small-sized accounts | ​ | 943,471 |  | 798,411
Others | ​ | 16,798 |  | 23,040
Total | ​ | 1,956,717 |  | 2,250,224
| ​
​ | ​ | ​ | ​ | ​
​ |  | For the nine months ended September 30,
​ |  | 2021 |  | 2022
​ | ​ | RMB | ​ | RMB
Online recruitment services to enterprise customers | ​ | ​ | ​ | ​
—Key accounts | ​ | 643,114 | ​ | 775,037
—Mid-sized accounts | ​ | 1,080,514 |  | 1,375,551
—Small-sized accounts | ​ | 1,413,426 |  | 1,241,060
Others | ​ | 31,424 |  | 37,139
Total | ​ | 3,168,478 |  | 3,428,787

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 + Details
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