A(1010)10
B(1011)11
C(1100)12
D(1101)13
E(1110)14
F(1111)15
0(0000)0
1(0001)1
2(0010)2
3(0011)3
4(0100)4
5(0101)5
6(0110)6
7(0111)7
8(1000)8
9(1001)9