assigned value
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how do you find out if atom has got assigned value to it, or is no value =
in member of a sequence?
atom a --hasn't assigned value
a=3D3 --has assigned value
seuqence s=3D"ABC"
s[0] --has no value
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-2" =
http-equiv=3DContent-Type>
<META content=3D"MSHTML 5.00.2614.3401" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>how do you find out if atom has got =
assigned value=20
to it, or is no value in member of a sequence?</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>atom a --hasn't =
assigned value</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>a=3D3 --has assigned value</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>seuqence s=3D"ABC"</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>s[0] --has no =
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