I have a tiddler named "math example" with two fields: "one" = 7 and "two" 
= 8

if I put this in the filter part of the advanced search field
[tag[math example]get[text]length[]sum[]]

it gives the result "18" because the text in them (2 tiddlers tagged "math 
example") is "bla bla" and "bla bla bla" respectively (7 and 11 characters 
long)

but how would I get  a sum of the two fields in that original tiddler?

if I do this:
[title[math example]get[two]sum[]]

it returns "8" and likewise "7" for "get[one]"

but this doesn't work at all:
[title[math example]get[two]get[one]sum[]]


Is what I'm trying to do possible with just the normal TW5 tools?
(version 5.1.21)  I also tried putting a "+" between them and also starting 
both with "=" (i.e. ...=get[one]=get[two]...)

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