RE: http://www.jsoftware.com/help/primer/basic_list_adding.htm
I think it would be nice to poke people's memory with a for_item. based example
instead of just using while.
Here's the naive version, done with for
addlis =: 4 : 0
r =. ''
for_i. x
do.
r =. r , (i_index { x) + (i_index { y)
end.
r
)
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