[Solved] L 3 = { w { a , b , c , d } : number of t

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L 3 = { w { a , b , c , d } : number of the last symbol in w > 1

3 = {

{

,

,

,

} "

: number of the last symbol in w

> 1} .

4 = {

{0, 1} *

: w contains

101

and

0110}

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