3
x1 x2 x3
00000111
4
000
010
111
110
3
x3 x1 x2
00010011
4
000
010
111
110
7
x1 x2 x5 x4 x3 x6 x7
01010101101010010101011110101000101010101110100000001011110010101010101110100110101101010010101110010111101100010101101011011001
5
0000000
1111111
0000100
1111110
1110000
2
x1 x2
0000
4
00
01
10
11
1
x1
10
4
1
1
0
0
0