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Energy gaps to charge and spin excitations and magnetic as well as dimer orders are calculated as a function of interaction strength $U/t$ by means of constrained-path quantum Monte Carlo method. It is found that the system is a semi-metal at $U/t\\lesssim 5.6$ and a Mott insulator with long-range antiferromagnetic order at $U/t \\gtrsim 6.6$. In the range $5.6\\lesssim U/t\\lesssim 6.6$, the ground state is an correlated insulator where both magnetic and dimer orders are absent. 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