```ruby
Dir[File.dirname(__FILE__) + '/lib/**/*.rb'].each {|file| require file }

class TernaryExpression < Expression::Base
  def initialize(variable_terminals, depth)
    super
    @operand_2 = ::Expression::OperandCreator.create(variable_terminals, depth)
    @conditional = ConditionalExpression.new(variable_terminals, depth)
  end

  def get_operator
  end

  def to_s
    "( " + @conditional.to_s + " ? " + @operand_1.to_s + " : " +  @operand_2.to_s + " )"
  end
end

class BinaryExpression < Expression::Base
  def initialize(variable_terminals, depth)
    super
    @operand_2 = ::Expression::OperandCreator.create(variable_terminals, depth)
  end

  def get_operator
    ['+', '-', '*', '/', '**'].sample
  end

  def to_s
    "( " + @operand_1.to_s + " " + @operator.to_s + " " +  @operand_2.to_s + " )"
  end
end

class ConditionalExpression < BinaryExpression
  def get_operator
    ['<', '<=', '>', '>='].sample
  end
end

class UnaryExpression < Expression::Base
  def get_operator
    '-'
  end

  def to_s
    "( " + @operator.to_s + " " + @operand_1.to_s + " )"
  end
end

10.times do
  e = Expression.create
  puts e.to_s
end

```

Remove inheritance from ternary class
user
```ruby
Dir[File.dirname(__FILE__) + '/lib/**/*.rb'].each {|file| require file }

class TernaryExpression
  def initialize(variable_terminals, depth)
    @operator  = get_operator
    @operand_1 = ::Expression::OperandCreator.create(variable_terminals, depth)
    @operand_2 = ::Expression::OperandCreator.create(variable_terminals, depth)
    @conditional = ConditionalExpression.new(variable_terminals, depth)
  end

  def get_operator
  end

  def to_s
    "( " + @conditional.to_s + " ? " + @operand_1.to_s + " : " +  @operand_2.to_s + " )"
  end
end

class BinaryExpression < Expression::Base
  def initialize(variable_terminals, depth)
    super
    @operand_2 = ::Expression::OperandCreator.create(variable_terminals, depth)
  end

  def get_operator
    ['+', '-', '*', '/', '**'].sample
  end

  def to_s
    "( " + @operand_1.to_s + " " + @operator.to_s + " " +  @operand_2.to_s + " )"
  end
end

class ConditionalExpression < BinaryExpression
  def get_operator
    ['<', '<=', '>', '>='].sample
  end
end

class UnaryExpression < Expression::Base
  def get_operator
    '-'
  end

  def to_s
    "( " + @operator.to_s + " " + @operand_1.to_s + " )"
  end
end

10.times do
  e = Expression.create
  puts e.to_s
end

```
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