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4.3.4. This problem involves B6ZS.
(a) Encode 1000 0001 1001. Assume the first mark is positive.
(b) Decode +-0+ 0+-0 -+-0 if there is no apparent error in the sequence; if there is an
error, decode the sequence as far as possible and then state the nature of the error.
(c) Repeat part (b) with 0+0+ -0-+ 0+0-.
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