1. Each person must add one type of item to the bucket.
2. The item must exist in every item added by the person before.
3. The number of each item increases with every item added.
4. Every post must include all the items currently in the bucket.
For example:
There is a bucket
There is are 2 kittens in the bucket.
There are 3 computers in every kitten in the bucket.
There are 4 light sabers in every computer in every kitten in the bucket.
etc.
There is a bucket.
There are 2 buckets in the bucket