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OTHER NON-CURRENT ASSETS | 12 Months Ended
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Dec. 31, 2019
OTHER NON-CURRENT ASSETS |
OTHER NON-CURRENT ASSETS | 14. OTHER NON-CURRENT ASSETS The breakdown of other non-current assets is as follows:
|  | 2018 |  | 2019
Prepaid other taxes - net of current portion (Note 29b) |  | 2,698 |  | 3,256
Prepaid annual frequency license - net of current portion (Note 9) |  | 1,743 |  | 1,488
Prepaid income taxes - net of current portion (Note 29a) |  | 894 |  | 1,088
Deferred charges - net |  | 474 |  | 539
Advances for purchases of property and equipment |  | 387 |  | 481
Convertible bonds |  | 213 |  | 357
Security deposit |  | 173 |  | 157
Restricted cash |  | 183 |  | 53
Prepaid rental |  | 2,662 |  | —
Others |  | 227 |  | 264
Total |  | 9,654 |  | 7,683
As of December 31, 2018 and 2019, deferred charges represent deferred Indefeasible Right of Use (“IRU”) agreement charges. Total amortization of deferred charges for the years ended December 31, 2017, 2018, and 2019 amounted to Rp46 billion, Rp56 billion, and Rp60 billion, respectively.

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