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достаточно одного Layout
IF(VAL(COUNTER(1,15,1,6,True)) <= 5, "A" & COUNTER(1,15,1,6,True),
IF(VAL(COUNTER(1,15,1,6,True)) >5 AND VAL(COUNTER(1,15,1,6,True)) <=10, "B" & COUNTER(1,15,1,6,True),
IF(VAL(COUNTER(1,15,1,6,True)) >10 AND VAL(COUNTER(1,15,1,6,True)) <=15, "C" &...