Rel-Acq doesn't guarantee a global order but SeqCst does?

Could someone explain with an example where it's clearly visible that Rel-Acq synchronization doesn't guarantee global ordering? I want to understand the essence of it
Thanks a lot!
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原文:https://www.a8q9.cn/en/article/rel-acq-doesn-t-guarantee-a-global-order-but-seqcst-does-21711c.html