// 易错点1：边界处理 - 移除所有数字时直接返回"0"
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Number (11): Everything in this space must add up to 11. The answer is 5-5, placed horizontally; 6-0, placed horizontally.
Someone in formal education, such as school or university, doing an apprenticeship or vocational course, is not considered to be Neet.
Programmable keys