The best replacement for once is when.

The best alternatives to once are rated as following:
★★★★★  when
★★★★★  ones
★★★★  after
★★★  twice
★★★  disc at once
★★★  gram
★★  track at once
★★  disk at once
★★  one time
★  once
★  include
★  as soon as
  newsies
  ifndef
  gramme
  include_once
  twice a day
  require

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