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0. If e1 and e2 are the regular expressions denoting the languages L1 and L2 respectively, then which of the following is wrong?
(e1) | (e2) is a regular expression denoting L1 ∪ L2
(e1) .(e2) is a regular expression denoting L1. L2
φ is not a regular expression
{ex} is a regular expression denoting L1*
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