Such projectors can be employed to search through T [ α 1 β 1 ]...[ α j β j ] for D ( j , 0 ) ⊕ ⊕ D ( 0 , j ) , and exclude all the rest. Relativistic second order wave equations for any j are then straightforwardly obtained in first identifying the D ( j , 0 ) ⊕ ⊕ D ( 0 , j ) sector in T [ α 1 β 1 ]...[ α j β j ] in (8A) by means of the Lorentz projector in (8C) and then imposing on the result the mass shell condition.