help me ?

[sotaro237 at gmail.com]

Define 2 lists. The first one must contain the integer values 1, 2 and 3 and the second one the string values a, b and c. Iterate through both lists to create another list that contains all the combinations of the A and B elements. The final list should look like one of the 2 lists:
1. [1a, 1b, 1c, 2a, 2b, 2c, 3a, 3b, 3c]
2. [a1, a2. a3, b1, b2, b3, c1, c2, c3]
BONUS: Make the final list contain all possible combinations : [1a, a1, 1b, b1, 1c, c1, 2a, a2, 2b, b2, 2c, c2, 3a, a3, 3b, b3, 3c, c3] 

Help me !