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

### Instruction:
With April 1986 as the introduced, what is the least clock speed (MHz)?

### Inputs:
table_name: table, columns: ['Processor', 'Model', 'Clock speed (MHz)', 'L1 cache (bytes)', 'Introduced', 'Discontinued']

### Response:
SELECT MIN Clock speed (MHz) FROM table WHERE Introduced = april 1986