Answer: The obvious structure of the hand, which is waiting strictly 3-sided for tiles some of which may be Honors is hand structure “Lesser/Greater Honors and Knitted Tiles”. Here is an example of a hand: .

The second hand which is waiting 3-sided for non-suited tiles must have very special, so-called “jumping” structure of the hand as different winning tiles change the structure of the complete hands from irregular to regular ones, for instance: . If add  we have “Seven Pairs” structure, while if add  or  then the hand structure is regular one.