For each of the following arguments, use the STTT to determine whether the argument is valid or invalid. For some of these arguments, Steps 2 C , 3 C , and 4 (i.e., the C-Sequence) will be most efficient; for some of these arguments Steps 2 P , 3 P , and 4 (i.e., the P-Sequence) will be most efficient.

(P₁): D ⊃ (E ꓦ F)
(P₂): G ⊃ (H ꓦ I)
(P₃): ~ E ⊃ (I ꓦ J)
(P₄): (I ⊃ G) ⋅ (~ H ⊃ ~ G)
(P₅): ~ J
∴ D . (G ꓦ I)