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Use "unstamped" in a sentence
"I am unaware of any change in Mexico which allows a customs (Aduana) official to take action on an immigration matter such as an unstamped FM3 but, as you say, I've been gone long enough to have missed that."
"They urge caution, however: "Any anticipation of stamping notes would lead to a run on banks in perceived weaker currencies—or people hoarding unstamped notes in the hope of converting them in another geographic territory.""
"City's greater class remains very much unstamped on this encounter."