TT-root systems of exceptional flag manifolds

TT-roots of a flag manifold M=G/HM=G/H of a compact semisimple Lie group GG are the characters of the torus Z(H)Z(H) corresponding to the one-dimensional Z(H)Z(H)-invariant subspaces of C⊗(g/h).We classify the systems of TT-roots of the flag manifolds MM of the exceptional compact simple Lie groups with the second Betti number b2(M)⩾2b2(M)⩾2.