3. Marks.
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   The marks is serves for change often used constants on symbolic 
 equivalent for  increasing read ability of the source text. 

 Main rules for writing the marks:

    1) symbols, which can not be included in marks:
                   # $ ( ) * + , - . / [ \ ] { | }

    2) mark can not begin from numerals values;

    3) the  sign  of  mark ending  is any sign of punctuation, 
       gap, sign of  tabulations,  the end of line, as well as 
       any one of symbol, enumerated in rule 1;

    4) the mark  is  not  comply  with reserved mnemonics (see 
       exhibit 1 - a table of reserved mnemonics);

    5) the length of the mark can  be  assign arbitrarily, but 
       assembler  will  recognize  only  first ten symbols; so 
       when  use  the  marks  more  than  ten  symbols then in 
       translations can appear some mistakes;

  Examples of the marks writing: - Loop
                                 - First_go
                                 - Mark_1
                                 - To_long_mark_is_incorrect