Write a Python program to compare two lists of numbers and return any combination of numbers that occur in both lists.
list1=[1,2,3,4,5,6]
list2=[3,4,5,7,8,9]
combinedList = [] 

for num1 in list1:
 for num2 in list2:
 if num1 == num2:
 combinedList.append(num1)

print(combinedList) # [3,4,5]