' comments

ef er d : nf pf nr pr
0  0  0  0  1  0  1
0  0  1  0  0  0  1
0  1  0  0  0  0  1
0  1  1  1  0  0  1
1  0  0  0  1  0  0
1  0  1  0  1  1  0
1  1  0  0  0  0  0
1  1  1  0  0  0  0
 ;