X 3

X 2

X 1

X 1 ( X 2 + X 3 ) + X 2 X 3

0

0

0

0

0

0

1

0

0

1

0

0

0

1

1

1

1

0

0

0

1

0

1

1

1

1

0

1

1

1

1

1