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with input(a,b) as ( select 'farelka', 'butelka' from dual ) select strt, len, substr(b,strt,len) lcs from input i, lateral(select length(i.b) + 1 - level len from dual connect by length(i.b) + 1- level >0) s, lateral(select level strt from dual connect by level + s.len -1 <= length(i.b)) where instr(a, substr(b,strt,len))>0

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