advancedresearch/prop

`hooo_nrimply` is too strong (`(¬(b => a))^c => ¬(b^c => a^c)`)

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pub fn proof() -> False {
    hooo_nrimply(fa::<Not<Imply<True, True>>>())(imply::id())
}

This also implies that tauto_hooo_nrimply is too strong, since tauto_hooo_nrimply implies hooo_nrimply.