Nothing
id.15to18=function(id.15){
if(length(id.15)==1){
rst=id.15to18.single(id.15)
}
if(length(id.15)>1){
rst=id.15to18.single(id.15[1])
for(i in 2:length(id.15)){
rst=c(rst,id.15to18.single(id.15[i]))
}
}
return(rst)
}
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