You can compact these shift together into a “mega shift”. Mega shifts are widenings / thinnings. Thinnings are basically generated by the shift operations, which kind of sort of commute.
Unions argue that "one day less" can be good for energy, productivity and society, and that normalising four‑day patterns can keep people in work who might otherwise drop out altogether.
，这一点在新收录的资料中也有详细论述
Go to technology，更多细节参见新收录的资料
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