Помогите пожалуйста решить 4ое

1/ Mikhail's and Maria's / Maxim's and Olga's 2/ Maxim's/ Victor's, Sergey's and Olga's 3/ Mikhail's and Nikolay's/ Victor's, Sergey's and Maxim's 4/Mikhail's/ Nikolay's 5/Victor's, Sergey's and Olga's/ Nikolay's and Maria's 6/ Nikolay's and Mikhail's/ Victor's, Sergey's and Maxim's 7/Mikhail's and Maria's/ Sergey's, Olga's and Maxim's 8/Nikolay's and Mikhail's/ Olga's