Equation Icon  ℓ = 3k + 1 [0,0, 1,0,0,0,0,0,k ], (8.93 ) ℓ = 3k + 2 [0,0, 0,0,0,1,0,0,k ], (8.94 ) ℓ = 3k + 3 [1,0, 0,0,0,0,0,1,k ]. (8.95 )