In this paper, we further develop previous work on asymptotically flat
    spacetimes and extend subleading BMS and dual BMS charges in a large $r$
    expansion to all orders in $r^{-1}$. This forms a complete account of this
    prescription in relation to the previously discovered Newman-Penrose charges.
    We provide an explanation for the origin of the infinite tower of linear
    Newman-Penrose charges with regards to asymptotic symmetries and justify why
    these charges fail to be conserved at the non-linear level as well as failing
    to exhibit full supertranslation invariance even at the linear level.

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