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diff --git a/helm/ocaml/mathql_interpreter/mQueryTLexer.mll b/helm/ocaml/mathql_interpreter/mQueryTLexer.mll
deleted file mode 100644
index ca51751f0..000000000
--- a/helm/ocaml/mathql_interpreter/mQueryTLexer.mll
+++ /dev/null
@@ -1,133 +0,0 @@
-(* Copyright (C) 2000, HELM Team.
- * 
- * This file is part of HELM, an Hypertextual, Electronic
- * Library of Mathematics, developed at the Computer Science
- * Department, University of Bologna, Italy.
- * 
- * HELM is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- * 
- * HELM is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with HELM; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- * MA  02111-1307, USA.
- * 
- * For details, see the HELM World-Wide-Web page,
- * http://cs.unibo.it/helm/.
- *)
-
-(*  AUTOR: Ferruccio Guidi <fguidi@cs.unibo.it>
- *)
-
-{ 
-   open MQueryTParser
-   
-   let debug = false
-   
-   let out s = if debug then prerr_endline s
-}
-
-let SPC   = [' ' '\t' '\n']+
-let ALPHA = ['A'-'Z' 'a'-'z' '_']
-let NUM   = ['0'-'9']
-let IDEN  = ALPHA (NUM | ALPHA)*
-let QSTR  = [^ '"' '\\']+
-
-rule comm_token = parse
-   | "(*"         { comm_token lexbuf; comm_token lexbuf }
-   | "*)"         { () }
-   | ['*' '(']    { comm_token lexbuf }
-   | [^ '*' '(']* { comm_token lexbuf }  
-and string_token = parse
-   | '"'         { DQ  }
-   | '\\' _      { STR (String.sub (Lexing.lexeme lexbuf) 1 1) }
-   | QSTR        { STR (Lexing.lexeme lexbuf) }
-   | eof         { EOF }
-and query_token = parse
-   | "(*"        { comm_token lexbuf; query_token lexbuf }
-   | SPC         { query_token lexbuf }
-   | '"'         { let str = qstr string_token lexbuf in
-                   out ("STR " ^ str); STR str }
-   | '('         { out "LP"; LP }
-   | ')'         { out "RP"; RP }
-   | '{'         { out "LC"; LC }
-   | '}'         { out "RC"; RC }
-   | '@'         { out "AT"; AT }
-   | '%'         { out "PC"; PC }
-   | '$'         { out "DL"; DL }
-   | '.'         { out "FS"; FS }
-   | ','         { out "CM"; CM }
-   | ';'         { out "SC"; SC }
-   | '/'         { out "SL"; SL }
-   | "add"       { out "ADD"   ; ADD    }
-   | "align"     { out "ALIGN" ; ALIGN  }
-   | "allbut"    { out "BUT"   ; BUT    }
-   | "and"       { out "AND"   ; AND    }
-   | "as"        { out "AS"    ; AS     }
-   | "attr"      { out "ATTR"  ; ATTR   }
-   | "be"        { out "BE"    ; BE     }
-   | "count"     { out "COUNT" ; COUNT  }
-   | "diff"      { out "DIFF"  ; DIFF   }
-   | "distr"     { out "DISTR" ; DISTR  }
-   | "else"      { out "ELSE"  ; ELSE   }
-   | "empty"     { out "EMPTY" ; EMPTY  }
-   | "eq"        { out "EQ"    ; EQ     }
-   | "ex"        { out "EX"    ; EX     }
-   | "false"     { out "FALSE" ; FALSE  }
-   | "for"       { out "FOR"   ; FOR    }
-   | "from"      { out "FROM"  ; FROM   }
-   | "if"        { out "IF"    ; IF     }
-   | "in"        { out "IN"    ; IN     }
-   | "inf"       { out "INF"   ; INF    }   
-   | "intersect" { out "INTER" ; INTER  }
-   | "inverse"   { out "INV"   ; INV    }   
-   | "istrue"    { out "IST"   ; IST    }
-   | "isfalse"   { out "ISF"   ; ISF    }
-   | "keep"      { out "KEEP"  ; KEEP   }
-   | "le"        { out "LE"    ; LE     }
-   | "let"       { out "LET"   ; LET    }
-   | "log"       { out "LOG"   ; LOG    }
-   | "lt"        { out "LT"    ; LT     }
-   | "main"      { out "MAIN"  ; MAIN   }
-   | "match"     { out "MATCH" ; MATCH  }
-   | "meet"      { out "MEET"  ; MEET   }
-   | "not"       { out "NOT"   ; NOT    }
-   | "of"        { out "OF"    ; OF     }
-   | "or"        { out "OR"    ; OR     }
-   | "pattern"   { out "PAT"   ; PAT    }
-   | "proj"      { out "PROJ"  ; PROJ   }
-   | "property"  { out "PROP"  ; PROP   }
-   | "select"    { out "SELECT"; SELECT }
-   | "source"    { out "SOURCE"; SOURCE }
-   | "stat"      { out "STAT"  ; STAT   }
-   | "sub"       { out "SUB"   ; SUB    }
-   | "subj"      { out "SUBJ"  ; SUBJ   }
-   | "sup"       { out "SUP"   ; SUP    }
-   | "super"     { out "SUPER" ; SUPER  }
-   | "then"      { out "THEN"  ; THEN   }
-   | "true"      { out "TRUE"  ; TRUE   }
-   | "union"     { out "UNION" ; UNION  }
-   | "where"     { out "WHERE" ; WHERE  }
-   | "xor"       { out "XOR"   ; XOR    }
-   | IDEN        { let id = Lexing.lexeme lexbuf in 
-                   out ("ID " ^ id); ID id }
-   | eof         { out "EOF"   ; EOF    }
-and result_token = parse
-   | SPC         { result_token lexbuf }
-   | "(*"        { comm_token lexbuf; result_token lexbuf }
-   | '"'         { STR (qstr string_token lexbuf) }
-   | '/'         { out "SL"; SL }
-   | '{'         { LC }
-   | '}'         { RC }
-   | ','         { CM }
-   | ';'         { SC }
-   | '='         { IS }
-   | "attr"      { ATTR }
-   | eof         { EOF  }