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→{{header|REXX}}: expanded the title of the REXX program. -- ~~~~
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<br>A variable with a NULL value has a length of 0 (zero).
<br><br>The DROP statement can be used to "un-define" a REXX variable.
<lang rexx>/*REXX program
if symbol('ABC')=="VAR" then say 'variable ABC is defined, value='abc"<<<"
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