<INITIAL> "let" => (Tokens.LET (yypos, yypos + size yytext));
<INITIAL> "in" => (Tokens.IN (yypos, yypos + size yytext));
+<INITIAL> "begin" => (Tokens.BEGIN (yypos, yypos + size yytext));
<INITIAL> "end" => (Tokens.END (yypos, yypos + size yytext));
<INITIAL> "with" => (Tokens.WITH (yypos, yypos + size yytext));
<INITIAL> "where" => (Tokens.WHERE (yypos, yypos + size yytext));