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assume cs:code, ds:data
data segment
db 'help '
db 'welc '
db 'hous '
data ends
code segment
start_a:mov ax, data
mov ds, ax
mov bx, 0
mov cx, 3
mov dx, cx
s_1:mov di, 0
mov cx, 4
s_2:mov al, ds:[bx + di]
and al, 11011111B
mov ds:[bx + di], al
inc di
loop s_2
add bx, 10H
mov cx, dx
loop s_1
mov ax, 4c00H
int 21H
code ends
end start_a