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SELECT LISTAGG(CHR(l+64)||CHR(MOD(l,26)+65))WITHIN GROUP(ORDER BY l)FROM(SELECT CEIL(LEVEL/13)l FROM DUAL CONNECT BY LEVEL<=26*13LEVEL<339)GROUP BY l; Un-golfed
SELECT LISTAGG(CHR(l+64)||CHR(MOD(l,26)+65))WITHIN GROUP(ORDER BY l) FROM ( SELECT CEIL(LEVEL/13)l FROM DUAL CONNECT BY LEVEL<=26*13LEVEL<339 -- 26*13+1 ) GROUP BY l SELECT LISTAGG(CHR(l+64)||CHR(MOD(l,26)+65))WITHIN GROUP(ORDER BY l)FROM(SELECT CEIL(LEVEL/13)l FROM DUAL CONNECT BY LEVEL<=26*13)GROUP BY l; Un-golfed
SELECT LISTAGG(CHR(l+64)||CHR(MOD(l,26)+65))WITHIN GROUP(ORDER BY l) FROM ( SELECT CEIL(LEVEL/13)l FROM DUAL CONNECT BY LEVEL<=26*13 ) GROUP BY l SELECT LISTAGG(CHR(l+64)||CHR(MOD(l,26)+65))WITHIN GROUP(ORDER BY l)FROM(SELECT CEIL(LEVEL/13)l FROM DUAL CONNECT BY LEVEL<339)GROUP BY l; Un-golfed
SELECT LISTAGG(CHR(l+64)||CHR(MOD(l,26)+65))WITHIN GROUP(ORDER BY l) FROM ( SELECT CEIL(LEVEL/13)l FROM DUAL CONNECT BY LEVEL<339 -- 26*13+1 ) GROUP BY l SELECT LISTAGG(CHR(l+64)||CHR(MOD(l,26)+65))WITHIN GROUP(ORDER BY l)FROM(SELECT CEIL(LEVEL/13)l FROM DUAL CONNECT BY LEVEL<=26*13)GROUP BY l; Un-golfed
SELECT LISTAGG(CHR(l+64)||CHR(MOD(l,26)+65))WITHIN GROUP(ORDER BY l) FROM ( SELECT CEIL(LEVEL/13)l FROM DUAL CONNECT BY LEVEL<=26*13 ) GROUP BY l