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It was recently conjectured that $f$ is a permutation polynomial of $\\Bbb F_{q^2}$ if and only if one of the following holds: (i) $t=1$, $q\\equiv 1\\pmod 4$; (ii) $t=-3$, $q\\equiv \\pm1\\pmod{12}$; (iii) $t=3$, $q\\equiv -1\\pmod 6$. 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