Execution Instruction
Execution instruction of the quote. Default - `any_part_of` - `"all_or_none (AON)"` - The quote can only be filled entirely or not at all, ensuring that its amount matches the amount specified in the Block RFQ. Additionally, 'all_or_none' quotes have priority over 'any_part_of' quotes at the same price level. - `"any_part_of (APO)"` - The quote can be filled either partially or fully, with the filled amount potentially being less than the Block RFQ amount.
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