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May I know how to decode hex?
You mean like this?

Hex --> Binary

0 --> 0000
1 --> 0001
2 --> 0010
3 --> 0011
4 --> 0100
5 --> 0101
6 --> 0110
7 --> 0111
8 --> 1000
9 --> 1001
A --> 1010
B --> 1011
C --> 1100
D --> 1101
E --> 1110
F --> 1111
 
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