[R] Selecting elements from all items in a list

[geotheory]

Basic question (if you know the answer)...  I am dealing with a list of
commonly-formatted sub-lists, for example:

l <- list("")
l[[1]] <- c("A1","A2","A3")
l[[2]] <- c("B1","B2","B3")
l[[3]] <- c("C1","B2","B3")

Lets say I need to extract every 2nd item (i.e. A2, B2, C2).  [[]] cannot be
used.   l[2] returns practically the same as l[[2]].  Is there a way to
achieve this without having to loop or convert to data.frame?

Thanks in advance.

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