|After responder's 1NT responses if opener
has 4-card heart suit, he must rebid it..
I fresponder has a good minor (at least with 7+ honor points)
with 4-cards, he rebids his minor..
If 4- card minor is not good opener rebids his spades..
Note1: If opener's major suit is 7-cards he may rebid his major
Note2- If opener has 5-cards heart and 4-cards spades, he
can not rebid sapdes (it would be revrse), instaed bids clubs (even
clubs are 2-cards)