==== opening 1NT ====
12-14 or 15-17. we play the same system in both cases. it may have 5 card major, but we have no mechanism to detect this.

1NT
  * 2C = simple stayman, only 2D/H/S answers allowed
  * 2H/S = transfer
  * 2S = :!: transfer to clubs OR BAL INV
  * 2NT = transfer to diamonds