Like excel SEQUENCE Function but for generating character.

CHARSEQUENCE.lambda

//This will generate character sequence based on param. 
//Example case =CHARSEQUENCE(2, 2,"AA",2) will give an output like this ={"AA","AC";"AE","AG"}
CHARSEQUENCE =LAMBDA(NumberOfRow, NumberOfColumn, [StartChar], [Step],
    LET(
        _StartCol, IF(ISOMITTED(StartChar), 1, COLUMN(INDIRECT(StartChar & 1))),
        _StepCorrected, IF(ISOMITTED(Step), 1, Step),
        _Array, SEQUENCE(NumberOfRow, NumberOfColumn, _StartCol, _StepCorrected),
        _Result, MAP(
            _Array,
            LAMBDA(Curr,
                LET(
                    Address, ADDRESS(1, Curr, 4),
                    RemoveRow, MID(Address, 1, LEN(Address) - 1),
                    RemoveRow
                )
            )
        ),
        _Result
    )
);