Every cross-psalm pair previously shared one antiphon under just the
first psalm, which read inconsistently once psalter-distribution.yml's
reslice left some pairs intact and split others. Each pair is now two
single-psalm groups: the psalm whose own words the shared antiphon
actually quoted keeps it, and its former partner gets a real antiphon
borrowed from elsewhere in the reference corpus where one exists, else
one composed fresh from its own opening verse.
will
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