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12 cards from this deck
Exactly 4 (a nibble)
A 4-bit binary number
Base 16 (242^424)
0-9 and A-F (16 symbols)
0 to 15
Split into 4-bit groups from right
Add leading zeros
Each hex digit → 4 binary digits, combine all
1010
1111
00 to FF
00000000 to 11111111
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