P          Q          R          S               T

          0          0          0          0               0

          0          0          0          1               0

          0          0          1          0               1

          0          0          1          1               1

          0          1          0          0               0

          0          1          0          1               0

          0          1          1          0               1

          0          1          1          1               1

          1          0          0          0               1

          1          0          0          1               1

          1          0          1          0               1

          1          0          1          1               1

          1          1          0          0               1

          1          1          0          1               1

          1          1          1          0               1

          1          1          1          1               1