[R] Apply function over elemetns of a list

[PQuery]

Hello,

I have a list "ll - see below" on which I would like to apply a function
accessing every pair of elements in the list. For instance, I want to apply
the "sum" function on "6635 + 6636" and return the sum, the on "6635 +
6637", ... 

Any hint to do that using apply / mapply / rapply ?

Thanks,

> ll
[[1]]
[1] "6635" "6636"

[[2]]
[1] "6635" "6637"

[[3]]
[1] "6636" "6637"
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