anchor.diff:  "ODDLPRICE"; "ODDLYIELD"; "OR";
   "PRICE"; "PRODUCT"; 
   "RTD"; 
  -"STDEV"; "STDEV.P"; "STDEV.S"; "STDEVA"; "STDEVP"; "STDEVPA"; "SUBTOTAL"; "SUM"; "SUMIFS"; "SUMPRODUCT"; "SUMSQ"; "SWITCH";
  +"STDEV"; "STDEV.P"; "STDEV.S"; "STDEVA"; "STDEVP"; "STDEVPA"; "SUBTOTAL"; "SUMIFS"; "SUMPRODUCT"; "SUMSQ"; "SWITCH";
   "TEXTJOIN"; 
   "VAR"; "VAR.P"; "VAR.S"; "VARA"; "VARP"; "VARPA"; "VDB";
   "XOR";
  
positive.code: "ODDFPRICE"; "ODDFYIELD"; "ODDLPRICE"; "ODDLYIELD"; "OR";
  "PRODUCT"; 
  "RTD"; 
  "STDEV"; "STDEV.P"; "STDEV.S"; "STDEVA"; "STDEVP"; "STDEVPA"; "SUBTOTAL"; "SUM"; "SUMPRODUCT"; "SUMSQ"; "SWITCH";
  "TEXTJOIN"; 
  "VAR"; "VAR.P"; "VAR.S"; "VARA"; "VARP"; "VARPA";
  "XOR"]
  
negative.code: "OCT2BIN"; "OCT2DEC"; "OCT2HEX"; "ODD"; "OR"; 
  "PHI"; "PHONETIC"; "PRODUCT"; "PROPER";
  "RADIANS"; "RIGHT"; "RIGHTB"; "ROMAN"; "ROW"; "ROWS";
  "SEC"; "SECH"; "SECOND"; "SHEET"; "SHEETS"; "SIGN"; "SIN"; "SINH"; "SKEW"; "SKEW.P"; "SQL.REQUEST"; "SQRT"; "SQRTPI"; "STDEV"; "STDEV.P"; "STDEV.S"; "STDEVA"; "STDEVP"; "STDEVPA"; "SUMPRODUCT"; "SUMSQ"; 
  "T"; "TAN"; "TANH"; "TIMEVALUE"; "TRANSPOSE"; "TREND"; "TRIM"; "TRUNC"; "TYPE";
  "UNICHAR"; "UNICODE"; "UPPER";
  "VALUE"; "VAR"; "VAR.P"; "VAR.S"; "VARA"; "VARP"; "VARPA"; 
  