spot_cred = 'P';
tag_cred = 'R';

new_A=array(D)
new_D=array(P,R)
new_P=array(A,D,R,G)

is_valid=0

index = 0

if time > 5:00:
	for item in new_ + spot_cred

		if tag_cred == new_ + spot_cred[index]:
			$is_valid = 1;
		index = index + 1	

else if tag_cred == spot_cred:
	is valid =1;