The lower sequence (lower sequence identifier list) and variable identifier list are
      displayed on the right screen of the sequence identifier.
                   

     (1) Content setting of lower sequence
      In the content description, position the cursor where you want to set
      the subsequence, select the sequence identifier you want to set,
      and click the select button to set the sequence identifier in the content.
     
      After moving the cursor to the sequence position you want to set in the contents,
      select the sequence identifier you want to set from the lower sequence and
      click the set button.
     
      A sequence identifier is set at the cursor position in the content.
      Also, 1 is set in the setting of the sequence identifier of the lower sequence.
     Setting the same sequence identifier to the contents will add the value of the setting.
     A method that does not use the set button is to write the sequence identifier
     in the subordinate sequence directly in the content.
     In this case, the settings count will not flourish,
     so click the refresh button on the right.
     The setting count is reflected.

    (2) Unset contents of lower sequence
        If you want to remove from the content by the sequence identifier of
       the subsequence set in the content,
       select the sequence identifier you want to remove from the subsequence.
       If there are multiple occurrences of the same sequence identifier,
       remove the first one encountered.
       
      Clicking the delete button will remove the sequence identifier set in the content.
     
      As a method without using the delete button,
     there is a method to delete the sequence identifier directly from
     the contents with the Del and BackSpace keys.
     In this case, the settings count will not flourish, so click the refresh button on the right.
     The setting count is reflected.

    (3) Content setting of variable identifier
       In the content description, position the cursor where you want to set
       the variable identifier, select the variable identifier you want to set and
       click the Select button to set the sequence identifier in the content.
      
       Move the cursor to the position of the variable identifier you want to set
       in the contents, select the variable identifier you want to set from
       the variable identifier list, and click the Set button.
        
      A variable identifier is set at the cursor position in the content.
      Also, 1 is set in the variable identifier setting. Setting the same variable identifier
      to the contents will add the value of the setting.
      As a method without using the setting button,
     there is a method of writing the variable identifier in the variable identifier
     directly in the contents. In this case, the settings count will not flourish,
     so click the refresh button on the right. The setting count is reflected.

    (4) Unset contents of variable identifier
       If you want to delete a variable identifier set in the contents from the contents,
       select the variable identifier you want to delete from the variable identifier list.
       If there are multiple occurrences of the same variable identifier,
       remove the first one encountered.
             
       Click the Delete button to remove the variable identifier set in the content.
        
       As a method without using the delete button, there is a method to delete
       the variable identifier directly from the contents with the Del and BackSpace keys.
       In this case, the settings count will not flourish,
       so click the refresh button on the right.
      The setting count is reflected.