Show that L 0 is not regular. (Hint. Use the closure properties of regular languages!) Please explain all the steps so I can learn from it!

L {x E {a, b)' | x contains an equal number of occurrences of ab and ba) is regular. Consider the language L'-{x {a, b, c)' | x contains an equal number of occurrences of ab and ba) L {x E {a, b)' | x contains an equal number of occurrences of ab and ba) is regular. Consider the language L'-{x {a, b, c)' | x contains an equal number of occurrences of ab and ba)