For implementers, there's no Transformer protocol with start(), transform(), flush() methods and controller coordination passed into a TransformStream class that has its own hidden state machine and buffering mechanisms. Transforms are just functions or simple objects: far simpler to implement and test.
How we tested ergonomic keyboards，详情可参考safew官方下载
重复遍历数组，比较相邻元素，如果顺序错误就交换，详情可参考同城约会
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