Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the lowest image with a 20w Harrison, and less than 20 for Ashmolean?

### Inputs:
table_name: table, columns: ['Image', 'Smith', 'Ashmolean', 'Foster', 'Hahland', 'Dinsmoor', 'Hofkes-Brukker', 'Harrison', 'Cooper', 'BM/Corbett']

### Response:
SELECT MIN Image FROM table WHERE Harrison = 20w AND Ashmolean < 20