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Adverb: as required
  1. According to need (physicians use PRN in writing prescriptions)
    - as needed, pro re nata, PRN

Nearest

as follows
as if
as if by magic
as it is
as it were
as luck would have it
as much as possible
as needed
as of
as of late
as required
as such
as the crow flies
as though
as usual
as we say
as well
as yet
asa dulcis
Asa Gray
Asa Yoelson