get_stratum_names <-
function(x){
y<-strsplit(gsub("Stratum: ","",unique(x[grep("Stratum:",x)])),"")
if(length(y)==0){return(NULL)}
ans<-sapply(y,function(i){
w<-range(which(i!=" "))
paste(i[w[1]:w[2]],collapse="")
})
ans
}
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