// TypeError: Cannot obtain lock — stream is permanently locked
Not Equal: Everything in this space must be different. The answer is 2-2, placed horizontally; 4-4, placed vertically; 0-0, placed vertically.
，这一点在服务器推荐中也有详细论述
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Under the new API design, transforms should not perform any work until the data is being consumed. This is a fundamental principle.