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Variational Monte Carlo calculations are carried out for ∧∧4H to explore the possibility of its existence,using realistic NN,NNN,and phenomenological ∧N and ∧NN interactions.We also perform calculations using FGNNand NSC97 ∧N potentials,and demonstrate the effect of the exchange part of the two-body ∧N interaction and three-body ∧NN interaction on the binding energy of ∧∧4H.Still the stability of ∧∧4H remains an open question and this hypeuclear system has to be explored more theoretically.