classify each of the following as living or non-living: dog, table, cat, tree, pen, book.
living: dog, cat, tree
non-living: table, pen, book
### Instruction: classify each of the following as living or non-living: dog, table, cat, tree, pen, book.
### Context: 
### Answer: living: dog, cat, tree
non-living: table, pen, book</s>