Font Strike identification does not work as expected

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The above highlighted line does not prevent Strikethrough fonts from being populated, but I can figure out why?

bump it up for response....

Feeling that the correct syntax was used as :

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, but Excel did not work with it.
I changed the line to

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.
This syntax works as expected.
Glitch??

I can work with this instead, and i simply modified the CD from Strikethrough to Regular instead.