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One day a new student, a kid came to me with her mother. talking about teachers of English at school she said that they were teaching only good, bad, white, black, etc. I replied: Madam, if you pay me what they are paid at school I'll teach good- bad , black- white too.
As Puskas, the famous Hungarian football geniuos of the 50's said: Little money, little football.Big money , big football. Don't sell your knowledge for nothing , folks.