'7th Heaven' laying out 7th chords

Using plurality ... Page 55 of the Let's Enjoy Piano Method ....the Major 7 chord is laid out with the minor triad on the right hand..///.. the minor 7 is laid out with the Major Triad on the right hand.///..and the Dominant 7 that is laid out with the diminished chord on the right hand

Major triads,minor triads,diminished Triads,. Ma 7..m7... dominant 7th,