a 100
CALL 500
CALL 200
CALL 500
INT  20

a 200
CALL 510
CALL 300
CALL 510
RET

a 300
CALL 520
CALL 400
CALL 520
RET

a 400
CALL 530
RET

a 500
PUSH AX
PUSH DX
MOV  AH,2
MOV  DL,30
INT  21
POP  DX
POP  AX
RET

a 510
PUSH AX
PUSH DX
MOV  AH,2
MOV  DL,31
INT  21
POP  DX
POP  AX
RET

a 520
PUSH AX
PUSH DX
MOV  AH,2
MOV  DL,32
INT  21
POP  DX
POP  AX
RET

a 530
PUSH AX
PUSH DX
MOV  AH,2
MOV  DL,33
INT  21
POP  DX
POP  AX
RET

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