flowchart RL

subgraph level_2_a [ ]
  subgraph level_1_a [ ]
    subgraph A_label [3b0n..]
      A
    end

    subgraph B_label [00ab..]
      B
    end
  end

  subgraph level_1_b [ ]
    subgraph C_label [4hdn..]
      C
    end

    subgraph D_label [j39a...]
      D
    end

    subgraph E_label [000m...]
      E
    end
  end
end

subgraph F_label [3c28...]
  F
end

F --> E --> D --> C --> B --> A

classDef default fill:#EABDE6, stroke: none, color:#222;
classDef cluster fill:none, stroke:none, color:#222;

classDef level_one fill:none;
classDef level_two fill:none;

class level_1_a,level_1_b, level_one
class level_2_a, level_two

flowchart RL

subgraph level_2_a [ ]
  subgraph level_1_a [ ]
    subgraph A_label [3b0n..]
      A
    end

    subgraph B_label [00ab..]
      B
    end
  end

  subgraph level_1_b [ ]
    subgraph C_label [4hdn..]
      C
    end

    subgraph D_label [j39a...]
      D
    end

    subgraph E_label [000m...]
      E
    end
  end
end

subgraph F_label [3c28...]
  F
end

F --> level_1_b --> level_1_a

classDef default fill:#EABDE6, stroke: none, color:#222;
classDef cluster fill:none, stroke:none, color:#222;

classDef level_one fill:#D69ADE;
classDef level_two fill:none;

class level_1_a,level_1_b, level_one
class level_2_a, level_two

flowchart RL

subgraph level_2_a [ ]
  subgraph level_1_a [ ]
    subgraph A_label [3b0n..]
      A
    end

    subgraph B_label [00ab..]
      B
    end
  end

  subgraph level_1_b [ ]
    subgraph C_label [4hdn..]
      C
    end

    subgraph D_label [j39a...]
      D
    end

    subgraph E_label [000m...]
      E
    end
  end
end

subgraph F_label [3c28...]
  F
end

A ~~~ B
C ~~~ D ~~~ E
F --> level_2_a

classDef default fill:#EABDE6, stroke: none, color:#222;
classDef cluster fill:none, stroke:none, color:#222;

classDef level_one fill:none;
classDef level_two fill:#AA60C8;

class level_1_a,level_1_b, level_one
class level_2_a, level_two