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OTHER NON-CURRENT ASSETS | 12 Months Ended
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Dec. 31, 2018
OTHER NON-CURRENT ASSETS |
OTHER NON-CURRENT ASSETS | 13. OTHER NON-CURRENT ASSETS The breakdown of other non-current assets is as follows:
|  | 2017 |  | 2018
Prepaid other taxes - net of current portion (Note 30) |  | 3,075 |  | 2,698
Prepaid rental - net of current portion (Note 9) |  | 2,688 |  | 2,662
Frequency license - net of current portion (Note 9) |  | 2,019 |  | 1,743
Prepaid income taxes - net of current portion (Note 30) |  | 763 |  | 894
Deferred charges |  | 413 |  | 474
Advances for purchases of property and equipment |  | 2,805 |  | 387
Convertible bonds |  | 64 |  | 213
Restricted cash |  | 31 |  | 183
Security deposit |  | 116 |  | 173
Others |  | 296 |  | 227
Total |  | 12,270 |  | 9,654
Prepaid rental covers rent of leased line, telecommunication equipment, land and building under lease agreements of the Group with remaining rental periods ranging from 1 to 40 years. As of December 31, 2017 and 2018, deferred charges represent deferred Indefeasible Right of Use (“IRU”) Agreement charges. Total amortization of deferred charges for the years ended December 31, 2016, 2017 and 2018 amounted to Rp40 billion, Rp46 billion and Rp56 billion, respectively. Refer to Note 33 for details of related party transaction.

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