>>foreach item data [append item/6 "^/" repeat c 5 [append item/:c ","]]
>> print data
C1, C2, C3, C4, C5, SUM
1, 5, 9, 13, 17, 45
2, 6, 10, 14, 18, 50
3, 7, 11, 15, 19, 55
4, 8, 12, 16, 20, 60
>>write fileout.csv form data