FLEXIBLE!
Google "flexible tile grout" and find several products and lots of discussion. Not being an expert I could only add that total removal of all existing grout would be "job one".
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Hal & Ginny Miller '04 Beaver Santiam PRT40
'04 Saturn Vue - US Gear Brake - Blue Ox tow
3"girls" (2 Irish Setters - 1 Retriever) - RIP Annie & Emily (12/26/2017)
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