VI vs sextuplet

VI

noun
  • verb, intransitive. 

name
  • VI (“U.S. Virgin Islands”) 

sextuplet

noun
  • A group of six notes played in the time of four, with accents on the first and fourth notes; a double triplet. 

  • A group of six objects. 

  • A group of six notes played in the time of four, with an accent only on the first note. 

  • One of a group of six persons or animals born from the same mother during the same birth. 

  • A group of six notes played in the time of four, with accents on the first, third and fifth notes. 

How often have the words VI and sextuplet occurred in a corpus of books? (source: Google Ngram Viewer )