5.
odd_rows([[1, 2, 3], [1, 3, 5], [2, 2, 2], [3, 3, 3]])
odd_rows([[1, 2, 3], [1, 3, 6], [2, 2, 2], [3, 8, 3]])
odd_rows([[1, 3], [1, 6], [2, 5], [3, 7], [9, 1]])
odd_rows([[1, 2, 3, 4], [1, 3, 9, 1], [2, 4, 2, 3], [4, 7, 3, 2]])

6.
list_students("Petr:3,Pavel:5,Jana:8,Petr:4,Martina:3")
list_students("Petra:4,Pavel:2,Pavel:5,Jan:3,Petra:5,Pavel:1")