-2             -1 
 1              0              0              0 
 1              1              1              0 
 0              1              1              0 
-1             -2             -2             -1 
-1             -2             -1             -1 
 16            =16?
 14            =14?
 8             =8?
 6             =6?
 10            is 10?
-1 =-1?
-14 
-14