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Feb 25 (Reuters) - Artificial intelligence-linked shares fell on Tuesday, in lead-up to AI bellwether Nvidia's (NVDA.O), opens new tab quarterly earnings, which could offer clarity on demand and justify the sector's lofty valuations. Technology stocks globally sold off this week after a TD Cowen analyst note said Microsoft has canceled leases for sizeable data center capacity in the U.S., with at least two private data-center operators.