OO_X
i1 : X = abstractProjectiveSpace 4 o1 = X o1 : a flag bundle with subquotient ranks {1, 4}
i2 : OO_X o2 = a sheaf o2 : an abstract sheaf of rank 1 on X
i3 : rank oo o3 = 1
i4 : chi ooo o4 = 1