sum

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Sum
sum x
Supported in K7, K9

sum is a primitive that is used to sum arrays or integers or characters.

It is equivalent to +/ in most K dialects. 

 sum 1 2 3
6.
 sum 1 2 
3.
 sum 1 2 67
70.
 sum "abc"
294.
Works in: K7, K9
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