My templates allow cross referencing of variables, constants and equations. 
So voltage will list all of the equations which use it. All good. I also 
have Greek letters listed for reference and all equations which use that 
letter will be listed. The problem comes with pi.. Pi is a constant AND a 
Greek letter, and is tagged with both of these and so lists equations with 
pi in twice. All the other Greek variables are called other things.. Eg 
thermal heat transfer / second is big Phi. Can I stop the variable template 
filter kicking in for title Pi? 
<$list filter='[is[current]tag[Greek Letters]]'>

Upper Case: {{!!variablelatexbig}}

Lower Case: {{!!variablelatexsmall}}

{{!!description}}

<$list filter="[title<currentTiddler>listed[greek]tag[Equation]] 
-[title<currentTiddler>] +[limit[1]]"><br><br>
<h2>Used in Equations</h2><br>
</$list>

<$list filter="[title<currentTiddler>listed[greek]tag[Equation]] 
-[title<currentTiddler>]">
<$link><$transclude field="title"/></$link>
<$transclude field="equation"/><br><br>
</$list>

</$list>


The variable, constant and Greek tags all have essentially the same code 
with slight variation. 

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