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10 DIM S1$ 'implicitly defined empty string
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20 S2$ = "" 'explicitly defined empty string
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30 S3$ = "Foo bar baz"
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40 S$=S1$ : GOSUB 200
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50 S$=S2$ : GOSUB 200
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60 S$=S3$ : GOSUB 200
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70 END
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200 IF LEN(S$)=0 THEN PRINT "Empty string" ELSE PRINT "Non-empty string"
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210 RETURN
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