variety F
i1 : X = abstractProjectiveSpace 4 o1 = X o1 : a flag bundle with subquotient ranks {1, 4}
i2 : tangentBundle X o2 = a sheaf o2 : an abstract sheaf of rank 4 on X
i3 : variety oo o3 = X o3 : a flag bundle with subquotient ranks {1, 4}