{"pre_text": ["system energy resources , inc .", "management 2019s financial discussion and analysis also in addition to the contractual obligations , system energy has $ 382.3 million of unrecognized tax benefits and interest net of unused tax attributes and payments for which the timing of payments beyond 12 months cannot be reasonably estimated due to uncertainties in the timing of effective settlement of tax positions .", "see note 3 to the financial statements for additional information regarding unrecognized tax benefits .", "in addition to routine spending to maintain operations , the planned capital investment estimate includes specific investments and initiatives such as the nuclear fleet operational excellence initiative , as discussed below in 201cnuclear matters , 201d and plant improvements .", "as a wholly-owned subsidiary , system energy dividends its earnings to entergy corporation at a percentage determined monthly .", "sources of capital system energy 2019s sources to meet its capital requirements include : 2022 internally generated funds ; 2022 cash on hand ; 2022 debt issuances ; and 2022 bank financing under new or existing facilities .", "system energy may refinance , redeem , or otherwise retire debt prior to maturity , to the extent market conditions and interest and dividend rates are favorable .", "all debt and common stock issuances by system energy require prior regulatory approval .", "debt issuances are also subject to issuance tests set forth in its bond indentures and other agreements .", "system energy has sufficient capacity under these tests to meet its foreseeable capital needs .", "system energy 2019s receivables from the money pool were as follows as of december 31 for each of the following years. ."], "post_text": ["see note 4 to the financial statements for a description of the money pool .", "the system energy nuclear fuel company variable interest entity has a credit facility in the amount of $ 120 million scheduled to expire in may 2019 .", "as of december 31 , 2016 , $ 66.9 million in letters of credit were outstanding under the credit facility to support a like amount of commercial paper issued by the system energy nuclear fuel company variable interest entity .", "see note 4 to the financial statements for additional discussion of the variable interest entity credit facility .", "system energy obtained authorizations from the ferc through october 2017 for the following : 2022 short-term borrowings not to exceed an aggregate amount of $ 200 million at any time outstanding ; 2022 long-term borrowings and security issuances ; and 2022 long-term borrowings by its nuclear fuel company variable interest entity .", "see note 4 to the financial statements for further discussion of system energy 2019s short-term borrowing limits. ."], "table": [["2016", "2015", "2014", "2013"], ["( in thousands )", "( in thousands )", "( in thousands )", "( in thousands )"], ["$ 33809", "$ 39926", "$ 2373", "$ 9223"]], "table_ori": [["2016", "2015", "2014", "2013"], ["(In Thousands)"], ["$33,809", "$39,926", "$2,373", "$9,223"]]}

Question: for the period from 2013 to 2016 , what was the combined balance ( in thousands ) for money pool receivables?\\n
Evidence:
table_2: 2016 the $ 33809 of 2015 is $ 39926 ; the $ 33809 of 2014 is $ 2373 ; the $ 33809 of 2013 is $ 9223 ;
Program: add(33809, 39926), add(#0, 2373), add(#1, 9223)
Answer:
str_answer: 85331
exe_answer: 85331