2 -> 20 4 -> 40 my_map[2] = 20 my_map[4] = 40 phones[dick] = 5678 phones[harry] = 7654 phones[tom] = 2345
2 -> 20
4 -> 40
my_map[2] = 20
my_map[4] = 40
phones[dick] = 5678
phones[harry] = 7654
phones[tom] = 2345