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A 22-year-old college student was busted for trying to sell “Fire Isiah” T-shirts outside Madison Square Garden on Wednesday night. Ivan Cash says he was hauled away in handcuffs, taken to the Midtown South Precinct, fingerprinted and held in a cell for three hours — until the Knicks lost to the Sacramento Kings 107-97. Then he was ticketed and released. Cash was waiting for a pal who has a vendor’s license when the cops swooped in, he said. He was charged with “intent to sell.” Cash said more than 100 frustrated Knicks fans had bought his T-shirts — at $20 a pop — at the last three home games. The graphic design student makes the shirts himself. Around a photo of beleaguered Knicks coach Isiah Thomas, black lettering on the bright orange shirts delivers the message: “Don’t hate the player or the game. Hate the coach.” “The police came up to me at every game before and asked me what I was doing,” Cash said. “I told them. They shrugged, and that was that.” Cash figures the arrest was meant “to put a lid on all the demands by fans for a new coach.”