#wedding_anniversary__weddinganniversary  the anniversary of the day on which you were married
  supertype:  #anniversary__dayofremembrance  the date on which an event occurred in some previous year
  subtype:  #silver_wedding_anniversary  the 25th wedding anniversary
  subtype:  #golden_wedding_anniversary  the 50th wedding anniversary
  subtype:  #diamond_wedding_anniversary__diamondweddinganniversary__diamond_wedding  the 60th wedding anniversary

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