 1.2:

    .

   .

  .

      .

____________________________________________________

 1.3:

   .

   .

     .

   .

     .

      .

        .

____________________________________________________

 1.5:

    .

     ,       ( ).

    .

    .

    .

   .

    .

   .

______________________________________________________

 1.6:

     .

     .

       .

     ( )

    .

  .

________________________________________________________

 1.6.5

     .

   .

________________________________________________________

 1.7

        .

    ,    .

   .

    .

     .

        ( ).

      .

     .