log lead ->	-1/0	0/1	1/2	2/3	3/4    total			
log silver	
  3/4      	 0     	0     	0     	0     	12     12 
  2/3      	 0      11      24      15      7      57 
  1/2       	 0      8      	49      20      0      77 
  0/1     	 2      1      	6       3      	0      12 
 -1/0      	 0      0      	1     	0     	0      1  
total  		 2      20     	80      38      19     159