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It's just a test sentence 'cos it contains every letter, (as above). Was used by communications engineers, if you couldn't read it your comms was stuffed.
Also check out these amazing test patterns (hex)
00 all bits off
FF all bits on
55 odd bits, on even off
AA odd bits, off even on
Oh the hours of fun I had machine coding a 6502 processor and a UART with the amazing speed of 9600 baud.
Stella, now trippin' down memory lane.
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