ASM program to find a letter in the given string

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MOV AX, DATA
MOV DS, AX
MOV ES, AX
MOV BX, 00
MOV CL, 00
LOOK:		MOV AL, A[BX]
CMP AL, KEY
JE L1
INC BX
CMP AL, 00
JNE LOOK
JMP L2
L1:		MOV CL, 01
END

MOV AX, DATA MOV DS, AX MOV ES, AX MOV BX, 00 MOV CL, 00 LOOK: MOV AL, A[BX] CMP AL, KEY JE L1 INC BX CMP AL, 00 JNE LOOK JMP L2 L1: MOV CL, 01 END