Identify the expressions that are valid in index notation and write them in Gibbs

notation.

$a_{pq}=b_p{d}_p+e_{pq}$

$a_{pq}=b_p{d}_q+e_{pq}$

$a_{lm}=T_{lp}{b}_p{c}_m$

$x_l=y_l+C_{ij}{D}_{jk}{e}_k$

$a_p=C_{pj}{D}_{jk}{e}_k+b_p$

$a_l=C_{lm}{d}_m+b_l{C}_{lm}{d}_m$

$a_k=b_{k}c+d_i{e}_{ik}$