12 *. 18
36
   12 *. 18 22
36 132
   *./ 12 18 22
396
   0 1 0 1 *. 0 0 1 1  NB. for truth valued arguments (0 and 1) it is equivalent to "and"
0 0 0 1
   *./~ 0 1
0 0
0 1