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> Blyad or blyat, btw?

Technically official word is "blyad" (блядь) - whore. Form "blyat" (блять) is pretty often used in informal speech, it mostly indicates exclamation, not "whore" as person/object. I.e. when you want to call someone a whore literally, use blyad, when you use exclamation or just swearing about something bad, you may use both forms.

"Blyad" sometimes even used in literature, "blyat" is purely modern internet-related thing.