* Characters immediately outside the valid letter ranges must fail (CF=1). * '@' (0x40) is just below 'A' (0x41) * '[' (0x5B) is just above 'Z' (0x5A) * '`' (0x60) is just below 'a' (0x61) * '{' (0x7B) is just above 'z' (0x7A) */
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