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Current theory predicts the initial and the CO core mass ranges for PISNe of $\\sim$140-260 $M_\\odot$ and $\\sim$65-120 $M_\\odot$ respectively for stars that are not much affected by the wind mass loss. The corresponding relative event rate between PISNe and core collapse supernovae is estimated to be $\\sim$1% for the present-day initial mass function. However, no confident PISN candidate has been detected so far, despite more than 1,000 supernovae are discovered every recent years. 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Current theory predicts the initial and the CO core mass ranges for PISNe of $\\sim$140-260 $M_\\odot$ and $\\sim$65-120 $M_\\odot$ respectively for stars that are not much affected by the wind mass loss. The corresponding relative event rate between PISNe and core collapse supernovae is estimated to be $\\sim$1% for the present-day initial mass function. However, no confident PISN candidate has been detected so far, despite more than 1,000 supernovae are discovered every recent years. 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