Source files (not including doc.lisp):
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  CODE LINES:
  142971 lines,   6364095 characters
  COMMENT LINES:
   80130 lines,   4826534 characters
  BLANK LINES:
   33605 lines,     33605 characters
  TOTAL:
  256706 lines,  11224234 characters
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Documentation (file books/system/doc/acl2-doc.lisp):
  130029 lines,   5742528 characters
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