-- in.journal --
include a.journal
include b.journal

-- a.journal --
year 2025
include c.journal

-- b.journal --
year 2030
include c.journal

-- c.journal --
06-15 lunch
  expenses:food  $5
  assets:cash

-- expect --
== in.journal ==
  1 include a.journal
  2 include b.journal
== a.journal ==
  1 year 2025
  2 include c.journal
== c.journal ==
  1 2025-06-15 lunch
== b.journal ==
  1 year 2030
  2 include c.journal
== c.journal ==
  1 2030-06-15 lunch