엑셀 함수 문의

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=LET(rngAl,B2:E5, xRws,ROWS(rngAl)-1, xCns,COLUMNS(rngAl)-1, MAKEARRAY(xRws*xCns,3,LAMBDA(iRw,iCn,

LET(xQuo,QUOTIENT(iRw-1,xCns)+1, xMod,MOD(iRw-1,xCns)+1, CHOOSE(iCn,INDEX(rngAl,xQuo+1,1),INDEX(rngAl,1,xMod+1),INDEX(rngAl,xQuo+1,xMod+1))))))