For those who play 3C as puppet stayman, and 3D as both majors(5-5) GI+, along with 2S as both minors weak or strong, the natural outcrop is for 3H to show a single suited club slam try(7+ winners) and 3S as the same in diamonds. Various responses may ensue, but strength and fit are easily found, and the NT opener gets to play the hand, protecting the strong hand.