14. The method is as follows: first put one of the three, then put three on the three vertices of the triangle just now, stand up, combine the other ends to form a three-dimensional triangle, then use six to form four triangles, then choose one side, then use three, or stand up on the three vertices, and three appear again, but the selected side is not counted (covered). Stand like this, every three forms three triangles, covering one. Starting from six, then three groups, there can be five groups, each group has two, 2*5= 10, plus the first four, one *** 14.