Compare lookup columns

Hello! I need to compare two lookup columns with email-addresses. If column 2 contains an email from column 1, the formula should return true, otherwise false.

Like this:
Email from table1 | Email from table2 | Answer
email1, email4 | email1, email2, email3, email4 | true
email5, email4 | email1, email2, email3, email4 | true
email5, email6 | email1, email2, email3, email4 | false

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