Classify each of the following as either a single digit or a double digit number: 8, 4, 1, 12, 87, 65, 3, 5, 45, 97, 6, 2, 34, 71, 9, 48, 0, 7, 31, 50.
Single digits include: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
Double digits include: 12, 31, 34, 45, 48, 50, 65, 71, 87, 97.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: Classify each of the following as either a single digit or a double digit number: 8, 4, 1, 12, 87, 65, 3, 5, 45, 97, 6, 2, 34, 71, 9, 48, 0, 7, 31, 50.
### Input: 
### Response: Single digits include: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
Double digits include: 12, 31, 34, 45, 48, 50, 65, 71, 87, 97.