parent[a] = a parent[b] = a parent[c] = f parent[d] = c parent[e] = d parent[f] = g parent[g] = h parent[h] = a parent[i] = c
parent[a] = a parent[b] = a parent[c] = f parent[d] = c parent[e] = d parent[f] = g parent[g] = h parent[h] = a parent[i] = c
::
::
::
