What is the largest known variogram (word square where repeated letters count as one square)?

language/english/spelling/sets.of.words/variogram

Problem

What is the largest known variogram (word square where repeated letters count
as one square)?

Show solution

  o  c  c  u  p  a  t  e  s
  c  h  i  n  a  m  i  n  e
  c  i  g  a  r  e  t  t  e
  u  n  a ll  o  t  t  e  d
  p  a  r  o  c  h  i  n  e
  a  m  e  t  h  y  s  t  a
  t  i  t  t  i  s  h  e  r
  e  n  t  e  n  t  e  s  t
  s  e  e  d  e  a  r  t  h
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Chris Long, 265 Old York Rd., Bridgewater, NJ 08807-2618