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->s,a,*r{r=[];aa.count{|x|r|*x|r!=r=(r|[x]r|x).pop(s)}}
Try it online!Try it online!
Thanks histocrat for shaving 3 bytes.
->s,a{r=[];a.count{|x|r!=r=(r|[x]).pop(s)}}
Try it online!
->s,a,*r{a.count{|*x|r!=r=(r|x).pop(s)}}
