A group of children are walking in the sand .
A group of adults are sitting in a pool .
A group of children are walking in the sand.
A group of adults are sitting in a pool.
The are children or adults, not both. The cannot be walking and sitting at the same time or be in the sand and the pool at the same time.
The are children or adults , not both . The can not be walking and sitting at the same time or be in the sand and the pool at the same time .