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ACCOUNTS RECEIVABLE, NET (Tables) | 12 Months Ended
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Dec. 31, 2021
Credit Loss [Abstract] |
Changes in the allowance for doubtful accounts | Changes in the allowance for doubtful accounts are as follows:
ACCOUNTS RECEIVABLE |
|  | Year ended December 31, |
|  | 2021 |  |  | 2020 |
Beginning of year |  | $ | 10,000 |  |  | $ | 10,000 |
Charged to costs and expenses |  |  | - |  |  |  | - |
Write-offs, net of recoveries |  |  | - |  |  |  | - |
End of year |  | $ | 10,000 |  |  | $ | 10,000 |

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