Nothing
extract <- function(x, what){
if(what %in% names(x)){
result <- x[[what]]
}else{
result <- list()
for(i in 1:length(x)){
result[[i]] <- x[[i]][[what]]
}
if(all(unlist(lapply(result, length)) == 1)){
result <- unlist(result)
}
}
return(result)
}
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