Nothing
centerlines<-function(n)
{
li<-NULL
for (i in 2:n)
for (j in 1:(i-1))
{
dummy<-numeric(n)
dummy[c(i,j)]<-0.5
li<-rbind(li,rep(1/n,n),dummy,rep(NA,n))
}
rownames(li)<-NULL
return(li)
}
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