optimized: spill

more 3: nested LET still present, does not use TEXTAFTER

=LET(
    comparelookup,
    LET(
        matchedstring, XLOOKUP(J3:J109, allquestions[number], allquestions[more3], "number not found", 0),
        compareleft, LEFT(matchedstring, 20),
        IF(compareleft="is incorrect because", MID(matchedstring, 22, LEN(matchedstring)-21), matchedstring)
    ),
    IF((comparelookup=K3:K109) + (comparelookup=L3:L109), "dupe", comparelookup)
)