input: Text: (A) Every 18 years a vintage is held, which is a kind of celebration of art. (B) Every 12 years a vintage is held, which also serves as a cultural festival that encourage young people to procreate. (C) Every 18 years a vintage is held, which serves as a kind of celebration of life for both young and old people. (D) Every 12 years a vintage is held, wherein the young people are made to harvest all the grapes. CULTURAL EXCHANGE BY KEITH LAUMER It was a simple student exchange—but Retief gave them more of an education than they expected! I Second Secretary Magnan took his green-lined cape and orange-feathered beret from the clothes tree. "I'm off now, Retief," he said. "I hope you'll manage the administrative routine during my absence without any unfortunate incidents." "That seems a modest enough hope," Retief said. "I'll try to live up to it." "I don't appreciate frivolity with reference to this Division," Magnan said testily. "When I first came here, the Manpower Utilization Directorate, Division of Libraries and Education was a shambles. I fancy I've made MUDDLE what it is today. Frankly, I question the wisdom of placing you in charge of such a sensitive desk, even for two weeks. But remember. Yours is purely a rubber-stamp function." "In that case, let's leave it to Miss Furkle. I'll take a couple of weeks off myself. With her poundage, she could bring plenty of pressure to bear." "I assume you jest, Retief," Magnan said sadly. "I should expect even you to appreciate that Bogan participation in the Exchange Program may be the first step toward sublimation of their aggressions into more cultivated channels." "I see they're sending two thousand students to d'Land," Retief said, glancing at the Memo for Record. "That's a sizable sublimation." Magnan nodded. "The Bogans have launched no less than four military campaigns
  Question: How often do Bachus vines mature and what is the significance of that timeline?
  Answer:
output: Every 12 years a vintage is held, which also serves as a cultural festival that encourage young people to procreate.