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9. Express each of these sets using a regular expression (5 pts each).
a. The set of strings with less than 4 bits.
b. The set of strings where every 0 is followed by another 0, then two 1s.
c. The set of strings with exactly seven 1s, with no consecutive 1s.
d. The set of strings ending in 00 and not containing 11.
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