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

### Instruction:
What is the sum of Solidat (c) that's purpose is display type, heavy duty jobs, and a hardness (brinell) is smaller than 33?

### Inputs:
table_name: table, columns: ['Sn/Sb (%)', 'Liquidat (°C)', 'Solidat (°C)', 'Hardness ( Brinell )', 'Purpose']

### Response:
SELECT SUM Solidat (°C) FROM table WHERE Purpose = display type, heavy duty jobs AND Hardness ( Brinell ) < 33