

Example 1

top-+-a-+-a1
    |   | 
    |   +-a2
    +-b
    | 
    +-c


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Example 2

1---2---3---4---5


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Example 3

top-+-a-+-b-+-c
    |   |   | 
    |   |   +-d
    |   +-e---f
    +-g---h


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Example 4

11-+-12-+-13-+-14
   |    |    | 
   |    |    +-24
   |    |    | 
   |    |    +-34
   |    +-43---44
   +-22-+-23
        | 
        +-33


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Example 5

+-----+   +-----+   +-----+   +-----+   +-----+
|5    |-+-|4    |-+-|3    |-+-|2    |---|1    |
+-----+ | +-----+ | +-----+ | +-----+   +-----+
        |         |         | 
        |         |         | +-----+
        |         |         +-|1    |
        |         |           +-----+
        |         | +-----+   +-----+
        |         +-|2    |---|1    |
        |         | +-----+   +-----+
        |         | 
        |         | +-----+
        |         +-|1    |
        |           +-----+
        | +-----+   +-----+   +-----+
        +-|3    |-+-|2    |---|1    |
        | +-----+ | +-----+   +-----+
        |         | 
        |         | +-----+
        |         +-|1    |
        |           +-----+
        | +-----+   +-----+
        +-|2    |---|1    |
        | +-----+   +-----+
        | 
        | +-----+
        +-|1    |
          +-----+


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Example 6

 7 -+- 61 -+- 511 -+- 4111 -+- 31111 --- 211111 --- 1111111 
    |      |       |        |                               
    |      |       |        | 
    |      |       |        +- 22111 
    |      |       |                 
    |      |       +- 3211 
    |      |               
    |      +- 421 --- 2221 
    |      |               
    |      | 
    |      +- 331 
    |             
    +- 52 --- 322 
    |             
    | 
    +- 43 
          


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Example 7

+-----+   +-----+   +-----+
|top  |-+-|a    |-+-|a1   |
+-----+ | +-----+ | +-----+
        |         | 
        |         | +-----+
        |         +-|a2   |
        |           +-----+
        | +-----+
        +-|b    |
        | +-----+
        | 
        | +-----+
        +-|c    |
          +-----+


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Example 8

+----+   +-+
|****|   |*|
|****|-+-+-+
|****|
|****|
+----+
       | 
       | +-+
       | |*|
       +-+-+
       | 
       | +-+
       | |*|
       +-+-+
       | 
       | +-+
       | |*|
       +-+-+
       | 
       | +-+
       | |*|
       +-+-+


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Example 9

+-----------------+   +-----+   +-+
|*****************|   |*****|   |*|
|*****************|   |*****|   +-+
|*****************|   |*****|
|*****************|   |*****|
|*****************|   |*****|
|*****************|   +-----+
|*****************|
|*****************|
|*****************|
|*****************|
|*****************|
|*****************|
|*****************|
|*****************|
|*****************|
|*****************|
|*****************|
+-----------------+
                    | 
                    | +-+
                    | |*|
                    | +-+


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Example 10

*-+-+-+   +-------+
  | |*|-+-|*******|
  | +-+ | |*******|
  |     | |*******|
  |     | |*******|
  |     | |*******|
  |     | |*******|
  |     | |*******|
  |     | +-------+
  |     | +-------+
  |     +-|*******|
  |       |*******|
  |       |*******|
  |       |*******|
  |       |*******|
  |       |*******|
  |       |*******|
  |       +-------+
  +-+-+   +-------+
    |*|-+-|*******|
    +-+ | |*******|
        | |*******|
        | |*******|
        | |*******|
        | |*******|
        | |*******|
        | +-------+
        | +-------+
        +-|*******|
          |*******|
          |*******|
          |*******|
          |*******|
          |*******|
          |*******|
          +-------+


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