"Neither A nor B$.$ Either C or B$.$ Not both D and C$.$ Therefore D$."$

$(AvvB)$

$(CvvB)$

$(D*C)$

$||$ asm $D$

$,|C|$

$3,4$ NOT BOTH

$2,5$ OR

$,|B|$ by $1$ NOR

$2-7$ RA

What information is missing in line $6?$

$(D*C)$

B

$(C*C)$