That gift card is using sequences of 5 characters. On the left, there are 4 [JM3C], with the 5th character missing. But because they use sequences of 5, that is the only missing character. It should be [JM3CX- QHHC9], with X representing one of the 36 possible characters (A-Z and 0-9). Now you have just 36 possible codes. Have fun 👍
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That gift card is using sequences of 5 characters. On the left, there are 4 [JM3C], with the 5th character missing. But because they use sequences of 5, that is the only missing character. It should be [JM3CX- QHHC9], with X representing one of the 36 possible characters (A-Z and 0-9). Now you have just 36 possible codes. Have fun 👍