A set made up of a pair and a punged discard must be "exposed" by setting it out face up, on the table to the right of the players' tiles, first, to show to the other players that he had the required pair, which gave him the right to appropriate the discard, and secondly, to separate the set from those completed entirely by draw from the wall. Sets completed by help of an appropriated (punged) discard, have only one-half the scoring value of exactly the same sets, completed by draw from the wall and kept in the hand.
Thus there are many advantages in drawing the third tile to complete a set of three of a kind when compared to "punging" the same, for in the former case, the set has twice as much scoring value, they are kept concealed in the hand and the opponents can only guess as to how nearly complete a concealed hand may be. A concealed set is counted as one of the four sets required to win, just as an exposed set would be, and a player having a set of three of a kind concealed has very good chances of filling it and thus forming four of a kind which counts a great deal higher.
A player may complete a set of four of a kind either by draw from the wall or "punging" an opponent's discard, if he has three of a kind already in his hand. In either case he must place the completed set on the table to the right of his tiles; all four face up if he "punged" the fourth, the two end tiles face down if he has "drawn" the fourth.
The player must immediately draw a "loose tile" (one of the two tiles on top of, and marking the end of the wall). Usually the one farthest from the end is taken, the one on the end moved up, and replaced by a tile from the end of the wall itself.
The "loose tile" was drawn because every time a player completes a set of four of a kind, he causes the rest of his hand to be one tile short. This must be made up every time four of a kind is filled by an extra tile drawn from the "loose" tiles.
Illustration No. 13.
In this illustration the player had three one dots in his hand when one of the opponents discarded the fourth one dot. This player "punged" it, matched the four of a kind, exposed them, drew a "loose tile" and discarded.
