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What is Which is not pre-malignant at some site - and explain in detail?
Bronchiectasis is not a premalignant condition.

Cholelithiasis predisposes to carcinoma Gallbladder
Ulcerative colitis predisposes to :          

(a) colorectal cancer-Sabiston 16th/ep. 953
(b) cholangiocarcinoma.

Leukoplakia: Predisposes to squamous cell carcinoma at the respective site.