In the formulas in the first paragraph,(a) A is the amount included under section 844.6 in computing the life insurer’s income from the discontinued business for its transition year;
(b) B is the aggregate of all amounts each of which is an amount deducted under section 844.8 in computing the life insurer’s income from the discontinued business for a taxation year that began before that time;
(c) C is the amount deducted under section 844.7 in computing the life insurer’s income from the discontinued business for its transition year; and
(d) D is the aggregate of all amounts each of which is an amount included under section 844.9 in computing the life insurer’s income from the discontinued business for a taxation year that began before that time.