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lambda l:{is for is in l for jc in is if is.count(jc)>2}
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lambda l:{i for i in l for j in i if i.count(j)>2}
Try it online!
lambda l:{s for s in l for c in s if s.count(c)>2}
lambda l:{i for i in l for j in{*i} i if i.count(j)>2}
lambda l:{i for i in l for j in{*i}if i.count(j)>2}
lambda l:[i{i for i in l for j in{*i}if i.count(j)>2]>2}
lambda l:[i for i in l for j in{*i}if i.count(j)>2]
