Romex 2NT - 3♣ - 

3♦    =    Denies 4 card ♥ and 5 card ♠. Does not deny 4 card ♠    ➲  

3♥    =    4 or 5 card ♥    ➤    3♠ = asking    ➤    3NT = 4 card ♥ ;    4  = 5 card ♥

3♠    =    5 card ♠

3NT =    4♥ in 4♠    ➤    pass = no 4 card M; 4m = 4 card M

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