Nothing

```
#x=c("a","B","c")
strCombine2=function(x,sep=" ") { # produce "a B c"
n=length(x)
y=paste(x[1])
if(n==1) y=paste(x)
if(n>1) {
for (i in 2:n) { y= paste(y,x[i],sep=sep) }
}
y
}
#strCombine2(c("aa","b","d"),"_")
#strCombine2(c("aa","b","d"))
```

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