Nothing
"ancestors" <-
function(otree, vertex){
v.num <- match(vertex, otree$parent$child)
curr.anc <- vertex
curr.vertex <- v.num
anc.list <- vertex
while (curr.anc!="Root"){
curr.vertex <- otree$parent$parent.num[curr.vertex]
curr.anc <- otree$parent$child[curr.vertex]
anc.list <- c(anc.list, curr.anc)
}
anc.list
}
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