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a. Bid  4-card suit  "up the line",  6+ pts. Opener may not pass!
 
b. Denies a 4-card major, shows 6-10 pts 
c. Shows 3+card  support for Partner's 5-card ♥ suit and 6-10 pts 
d. Denies 3-card ♠ support, but shows 6-10 pts 
e. Shows 8-9 points, invities Partner to bid 3NT with 17-18 pts
  
In case "a." the Opener (N) must bid again ! In the other 4 cases Opener may pass.
  
Rule 
When neither player has passed when it was his/her turn to make an Opening bid : the bid of a new suit is forcing for one round !
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