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DO
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INPUT PROMPT "Enter two integers separated by a comma: ": A, B
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IF ABS(A)>1000 OR ABS(B)>1000 OR IP(A)<>A OR IP(B)<>B THEN
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PRINT "Both integers must be in the interval [-1000..1000] - try again."
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PRINT
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ELSE
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PRINT "Their sum is";A+B
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EXIT DO
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END IF
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LOOP
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END
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