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| local | |
| fun avgSum' sum n [] = ([], sum div n) | |
| | avgSum' sum n (x::xs) = | |
| let val (rs, avg) = avgSum' (sum+x) (n+1) xs | |
| in ((x-avg) :: rs, avg) end | |
| in | |
| val avgSum = #1 o avgSum' 0 0 | |
| end |
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