An empty hash map with 4 buckets.
Insert key "cat" with value 3. hash("cat") mod 4 = 0. Bucket 0 now holds cat:3.
Insert key "dog" with value 5. hash("dog") mod 4 = 2. Bucket 2 now holds dog:5.
Insert key "car" with value 7. hash("car") mod 4 = 0 – collision! Bucket 0 chains both entries: cat:3 and car:7.