If Event#1 happened but Event#2 never happened, can you say Event #1 happened first technically?

Abcde0
Yes, Event#1 happened first even thought Event#2 never happened
Vote A
No, you can't because it's the only event that happened so you can't say it happened first
Vote B
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GirlGuy
If Event#1 happened but Event#2 never happened, can you say Event #1 happened first technically?
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