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.MODEL SMALL
.STACK 64H
.DATA
MIXED DB 'AlBeRt EiNsTeIn'
ORG 0100H
FINAL DB 15 DUP(?)
.CODE
MAIN: MOV AX,@DATA
MOV DS,AX
MOV SI,OFFSET MIXED
MOV BX,OFFSET FINAL
MOV CX,7
LOWER: MOV AL,[SI]
CMP AL,41H
JB OVERL
CMP AL,5AH
JA OVERL
OR AL,00100000B
OVERL: MOV [BX],AL
INC SI
INC BX
DEC CX
LOOP LOWER
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MOV AH,4CH
INT 21H
END MAIN